Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #12 Jan 03 2024 23:47:00
%S 1,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
%T 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
%U 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
%N 1,0,0,1 followed by 0,0,0...
%C Dirichlet inverse of this sequence is A154282.
%F Multiplicative with a(2^2) = 1, a(2^e) = 0 for e<>2, a(p^e) = 0 for odd prime p. - _Andrew Howroyd_, Aug 05 2018
%t PadRight[{1,0,0,1},120,0] (* _Harvey P. Dale_, Aug 06 2012 *)
%o (PARI) a(n)={n==1 || n==4} \\ _Andrew Howroyd_, Aug 05 2018
%Y Cf. A154272, A154271, A154269.
%K nonn,mult
%O 1,1
%A _Mats Granvik_, Jan 06 2009