A292939 - OEIS

%I #13 Oct 07 2017 21:55:09

%S 1,3,5,7,11,13,15,19,27,29,31,37,53,59,61,63,67,83,95,101,107,127,131,

%T 139,149,163,173,179,181,197,211,227,255,269,277,293,305,317,347,349,

%U 373,379,389,419,421,443,461,467,491,509,511,519,523,541,547,557,563,587,613,619,653,659,661,677,701,709,757,773

%N Odd numbers k such that A292270((k-1)/2) is a square.

%H Antti Karttunen, <a href="/A292939/b292939.txt">Table of n, a(n) for n = 1..1001</a>

%F a(n) = 1 + 2*A292938(n).

%Y Union of A000225 and A292940.

%Y Cf. A001122, A292379 (subsequences).

%Y Cf. also A292270, A292938.

%K nonn

%O 1,2

%A _Antti Karttunen_ and _Vladimir Shevelev_, Oct 06 2017