This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A114995 #10 Jul 15 2021 10:18:42 %S A114995 2,5,9,10,13,14,22,25,50,66,125,250,293,314,349,1622,1642,2937,2966, %T A114995 3841,4298,4898,5270 %N A114995 Numbers k such that the sum of the first k double factorials (1!! + 2!! + ... + k!!) is prime. %C A114995 a(18) must be greater than 2300. The sum of the first 1642 double factorials is a (probable) prime with 2286 digits. %C A114995 Numbers corresponding to a(18)-a(23) are probable primes. - _Farideh Firoozbakht_, May 16 2010 %e A114995 5 belongs since 1!! + 2!! + 3!! + 4!! + 5!! = 29, a prime. %Y A114995 Cf. A114410, A079078. %K A114995 nonn %O A114995 1,1 %A A114995 _Giovanni Resta_, Feb 23 2006 %E A114995 a(18)-a(23) from _Farideh Firoozbakht_, May 16 2010