|
%I #5 Dec 15 2017 17:37:06
%S 1,4,15,31,424,895
%N Numbers n such that (partial sums of n times (n 1's)) + 1 is prime; or n such that Sum_{k=1..n} A053422(k) + 1 is prime.
%C Also, numbers n such that (20+20*(9*n-1)*10^n-81*(n^2+n))/1458 + 1 is prime.
%K more,nonn
%O 1,2
%A _Jason Earls_, Sep 02 2006
|
