%I #19 Jul 30 2024 07:30:06
%S 1,2,4,10,14,28,54,62,124,592,1088,3154,3920,5564,26510,28674,65124
%N Numbers k such that (2^(2k + 1) - 2)/3 + k - 1 is prime.
%C These primes are represented in the numeral system described in A235860 with the digit "2" followed to the right with k-1 "12" strings.
%e For n = 2, (2^5 - 2)/3 + 1 = 11, which is prime, so 2 is in the sequence.
%o (PARI) isok(n) = isprime((2^(2*n+1) -2)/3 + n-1); \\ _Michel Marcus_, Jan 28 2014
%Y Cf. A235860.
%K nonn
%O 1,2
%A _Robin Garcia_, Jan 28 2014
%E a(1) inserted and a(15)-a(17) from _Michael S. Branicky_, Jul 29 2024