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 A172515 First differences of A172513. 2
 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, 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, 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS 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 LINKS PROG (PARI) (D(v)=v[^1]-v[^-1]); A172515_vec(N)=D(A172513_upto(N*7\2)) \\ M. F. Hasler, Apr 11 2019 CROSSREFS Cf. A172513, A167389. Sequence in context: A329157 A082978 A005536 * A188590 A080038 A121937 Adjacent sequences:  A172512 A172513 A172514 * A172516 A172517 A172518 KEYWORD nonn AUTHOR Stephen Crowley, Feb 05 2010 EXTENSIONS Keyword "hard" removed by M. F. Hasler, Apr 11 2019 STATUS approved

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Last modified August 8 06:27 EDT 2020. Contains 336290 sequences. (Running on oeis4.)