%I #11 Dec 19 2016 12:34:23
%S 0,3,4,5,8,10,13,15,18,19,20,23,24,25,28,29,30,33,35,38,40,43,44,45,
%T 48,50,53,54,55,58,60,63,65,68,69,70,73,75,78,79,80,83,85,88,90,93,94,
%U 95,98,99,100,103,104,105,108,110,113,115,118,119,120,123,124,125,128,129,130
%N Numbers of the form (5h+1)*5^k-1 or (5h+4)*5^k-1 for h,k in N.
%H Ray Chandler, <a href="/A278998/b278998.txt">Table of n, a(n) for n = 1..10000</a>
%H Hao Fu, G.-N. Han, <a href="https://arxiv.org/abs/1601.04370">Computer assisted proof for Apwenian sequences related to Hankel determinants</a>, arXiv preprint arXiv:1601.04370 [math.NT], 2016. See sequence "J" in Section 2.2.
%t isok[n_]:=Module[{ord=IntegerExponent[n+1,5]},MemberQ[{1,4},Mod[(n+1)/5^ord,5]]];Select[Range[0,131],isok] (*_Ray Chandler_, Dec 17 2016*)
%Y Complement of A278999.
%K nonn
%O 1,2
%A _N. J. A. Sloane_, Dec 07 2016
%E More terms from _Ray Chandler_, Dec 17 2016