Evaluation of $sum_{p text{ is a prime }}frac{1}{p!}$












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$begingroup$


I apologize in advance, if these have been posted earlier (as I couldn't find them).



While surfing through the Internet, I came across the following problem:



Evaluate: $displaystylesum_{n=0}^{infty} frac{1}{(3n)!}$,
which I computed successfully by using roots of unity filter.



After a little while I became a bit curious and wondered how to compute the following series: $displaystylesum_{p text{ is a prime }}frac{1}{p!}$.



My first idea was to use sieve of erasthosthenes along with roots of unity filter but I can't figure out how to do so.



Questions similar to these are also coming to my mind, which I have no idea on how to approach to, like $sum_{n=0}^{infty}frac{1}{(n^2)!}$, etc.



If possible, please provide me little hints on how to proceed.



Thanks.










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  • 1




    $begingroup$
    I highly doubt either $sum_p1/p$ or $sum_n1/(n^2)!$ has a sensible closed form.
    $endgroup$
    – Wojowu
    Jan 25 at 16:53










  • $begingroup$
    @JackD'Aurizio Forgot an exclamation mark!
    $endgroup$
    – Wojowu
    Jan 25 at 17:21
















0












$begingroup$


I apologize in advance, if these have been posted earlier (as I couldn't find them).



While surfing through the Internet, I came across the following problem:



Evaluate: $displaystylesum_{n=0}^{infty} frac{1}{(3n)!}$,
which I computed successfully by using roots of unity filter.



After a little while I became a bit curious and wondered how to compute the following series: $displaystylesum_{p text{ is a prime }}frac{1}{p!}$.



My first idea was to use sieve of erasthosthenes along with roots of unity filter but I can't figure out how to do so.



Questions similar to these are also coming to my mind, which I have no idea on how to approach to, like $sum_{n=0}^{infty}frac{1}{(n^2)!}$, etc.



If possible, please provide me little hints on how to proceed.



Thanks.










share|cite|improve this question











$endgroup$








  • 1




    $begingroup$
    I highly doubt either $sum_p1/p$ or $sum_n1/(n^2)!$ has a sensible closed form.
    $endgroup$
    – Wojowu
    Jan 25 at 16:53










  • $begingroup$
    @JackD'Aurizio Forgot an exclamation mark!
    $endgroup$
    – Wojowu
    Jan 25 at 17:21














0












0








0





$begingroup$


I apologize in advance, if these have been posted earlier (as I couldn't find them).



While surfing through the Internet, I came across the following problem:



Evaluate: $displaystylesum_{n=0}^{infty} frac{1}{(3n)!}$,
which I computed successfully by using roots of unity filter.



After a little while I became a bit curious and wondered how to compute the following series: $displaystylesum_{p text{ is a prime }}frac{1}{p!}$.



My first idea was to use sieve of erasthosthenes along with roots of unity filter but I can't figure out how to do so.



Questions similar to these are also coming to my mind, which I have no idea on how to approach to, like $sum_{n=0}^{infty}frac{1}{(n^2)!}$, etc.



If possible, please provide me little hints on how to proceed.



Thanks.










share|cite|improve this question











$endgroup$




I apologize in advance, if these have been posted earlier (as I couldn't find them).



While surfing through the Internet, I came across the following problem:



Evaluate: $displaystylesum_{n=0}^{infty} frac{1}{(3n)!}$,
which I computed successfully by using roots of unity filter.



After a little while I became a bit curious and wondered how to compute the following series: $displaystylesum_{p text{ is a prime }}frac{1}{p!}$.



My first idea was to use sieve of erasthosthenes along with roots of unity filter but I can't figure out how to do so.



Questions similar to these are also coming to my mind, which I have no idea on how to approach to, like $sum_{n=0}^{infty}frac{1}{(n^2)!}$, etc.



If possible, please provide me little hints on how to proceed.



Thanks.







real-analysis sequences-and-series






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share|cite|improve this question













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share|cite|improve this question








edited Jan 25 at 17:02









Namaste

1




1










asked Jan 25 at 16:46









himanshu mallickhimanshu mallick

365




365








  • 1




    $begingroup$
    I highly doubt either $sum_p1/p$ or $sum_n1/(n^2)!$ has a sensible closed form.
    $endgroup$
    – Wojowu
    Jan 25 at 16:53










  • $begingroup$
    @JackD'Aurizio Forgot an exclamation mark!
    $endgroup$
    – Wojowu
    Jan 25 at 17:21














  • 1




    $begingroup$
    I highly doubt either $sum_p1/p$ or $sum_n1/(n^2)!$ has a sensible closed form.
    $endgroup$
    – Wojowu
    Jan 25 at 16:53










  • $begingroup$
    @JackD'Aurizio Forgot an exclamation mark!
    $endgroup$
    – Wojowu
    Jan 25 at 17:21








1




1




$begingroup$
I highly doubt either $sum_p1/p$ or $sum_n1/(n^2)!$ has a sensible closed form.
$endgroup$
– Wojowu
Jan 25 at 16:53




$begingroup$
I highly doubt either $sum_p1/p$ or $sum_n1/(n^2)!$ has a sensible closed form.
$endgroup$
– Wojowu
Jan 25 at 16:53












$begingroup$
@JackD'Aurizio Forgot an exclamation mark!
$endgroup$
– Wojowu
Jan 25 at 17:21




$begingroup$
@JackD'Aurizio Forgot an exclamation mark!
$endgroup$
– Wojowu
Jan 25 at 17:21










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