A281902 - OEIS

%I #10 Feb 08 2017 02:11:38

%S 0,2,5,6,9,11,12,14,17,19,20,24,27,29,30,32,35,36,39,41,42,44,46,50,

%T 51,53,54,55,56,57,62,65,66,69,71,72,74,75,77,80,82,84,87,89,90,95,96,

%U 100,101,104,107,109,110,111,116,117,119,120,122,126,127,128

%N Numbers n which have the form n = k^2 - k + (i^2-i)/2 + 2*k*i, k>=1, i>=0.

%C If prime p has form 8*n+1, then n is a member.

%H Peter J. C. Moses, <a href="/A281902/b281902.txt">Table of n, a(n) for n = 1..5000</a>

%F 8k^2+8n+1 is perfect square.

%Y Cf. A007519.

%K nonn

%O 1,2

%A _Vladimir Shevelev_, Feb 01 2017

%E More terms from _Peter J. C. Moses_, Feb 01 2017