A172515 First differences of A172513.

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

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

Table of n, a(n) for n=1..105.

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