A037259 Second differences of A037257.

4, 5, 7, 8, 10, 12, 13, 14, 15, 16, 17, 19, 21, 22, 23, 24, 25, 28, 29, 30, 31, 32, 33, 34, 35, 37, 39, 40, 41, 42, 43, 44, 45, 46, 47, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 62, 63, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn
• easy

Crossrefs

Cf. A005228, A030124, A037257.

Formula

a(n) = A037257(n+2) - 2*A037257(n+1) + A037257(n).

Extensions

More terms from Larry Reeves (larryr(AT)acm.org), Sep 25 2000