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%I #14 Apr 23 2019 02:14:00
%S 3,3,4,3,3,3,4,3,3,3,4,3,3,3,4,3,3,3,4,3,3,4,3,3,3,4,3,3,3,4,3,3,3,4,
%T 3,3,3,4,3,3,3,4,3,3,3,4,3,3,4,3,3,3,4,3,3,3,4,3,3,3,4,3,3,3,4,3,3,3,
%U 4,3,3,3,4,3,3,3,4,3,3,4,3,3,3,4,3,3,3,4,3,3,3,4,3,3,3,4,3,3,3,4,3,3,3,4,3
%N First differences of A172513.
%C This sequence appears to have only '3's and '4's. Indices of '4's seem to be given by A322408, but this is true only for n < 95: then the next term in A322408 is 95, but only a(96) = 4. - _M. F. Hasler_, Apr 19 2019
%o (PARI) (D(v)=v[^1]-v[^-1]); A172515_vec(N)=D(A172513_upto(N*7\2)) \\ _M. F. Hasler_, Apr 11 2019
%Y Cf. A172513, A167389.
%K nonn
%O 1,1
%A _Stephen Crowley_, Feb 05 2010
%E Keyword "hard" removed by _M. F. Hasler_, Apr 11 2019
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