A134409 Second differences of A006336.

0, 1, 1, 0, 2, 0, 3, 3, 0, 5, 5, 0, 8, 0, 11, 11, 0, 16, 0, 21, 21, 0, 29, 29, 0, 40, 0, 51, 51, 0, 67, 67, 0, 88, 0, 109, 109, 0, 138, 0, 167, 167, 0, 207, 207, 0, 258, 0, 309, 309, 0, 376, 0, 443, 443, 0, 531, 531, 0, 640, 0, 749, 749, 0, 887, 887, 0, 1054, 0, 1221, 1221, 0, 1428

Offset: 1

Author

Reinhard Zumkeller, Oct 24 2007

Keywords

• nonn

Comments

a(n) = A006336(n+2)-2*A006336(n+1)-A006336(n) = A134408(n+1)-A134408(n);

apart from 0 same range as A006336;

A001950(n) = Min(m: a(m) = A006336(n)).

Crossrefs

Cf. A001950, A006336, A134408.