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A155750 First differences of A031215. 1

%I

%S 4,6,6,10,8,6,10,8,10,8,10,12,6,6,18,8,12,12,10,8,12,6,24,6,10,12,12,

%T 8,10,12,18,6,20,12,10,14,10,14,12,12,12,10,14,6,16,12,12,18,20,16,12,

%U 8,16,8,12,6,22,6,12,14,10,18,18,14,10,14,12,18,22,12,6,12,18,6,18,6,24

%N First differences of A031215.

%C All terms are even. Do all even numbers (A005843) appear at least once?

%F a(n)= A001223(2n)+A001223(2n+1). - _R. J. Mathar_, Feb 27 2009

%F a(n)= A031131(2n). - _R. J. Mathar_, Feb 27 2009

%Y Cf. A110854, A155067.

%K nonn,easy

%O 1,1

%A _Paul Curtz_, Jan 26 2009

%E Edited and extended by _R. J. Mathar_, Feb 27 2009

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Last modified August 26 05:20 EDT 2019. Contains 326328 sequences. (Running on oeis4.)