A288409 - OEIS

%I #7 Feb 07 2019 14:58:07

%S 67,79,1009,10459,34459489,654729139,316234143289,

%T 2980227913743310874726229193921939

%N Primes of the form k!2+64, where k!2 is the double factorial number (A006852).

%C The next term has 211 digits. - _Harvey P. Dale_, Feb 07 2019

%H Robert Price, <a href="/A288409/b288409.txt">Table of n, a(n) for n = 1..8</a>

%H Henri& Renaud Lifchitz, <a href="http://www.primenumbers.net/prptop/searchform.php?form=n2+64&amp;action=Search">PRP Records.Search for n!2+64.</a>

%H Joe McLean, <a href="http://web.archive.org/web/20091027034731/http://uk.geocities.com/nassarawa%40btinternet.com/probprim2.htm">Interesting Sources of Probable Primes</a>

%H OpenPFGW Project, <a href="http://sourceforge.net/projects/openpfgw/">Primality Tester</a>

%t MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]];

%t Select[Table[MultiFactorial[i, 2] + 64, {i, 0, 100}], PrimeQ[#]&]

%t Select[Range[100]!!+64,PrimeQ] (* _Harvey P. Dale_, Feb 07 2019 *)

%Y Cf. A076193.

%K nonn

%O 1,1

%A _Robert Price_, Jun 08 2017