A111408 f(f(n+1))-f(f(n)), where f(0)=0, and for m>0, f(m) = sigma(m) = A000203(m).

1, 3, 3, 1, 4, 16, -13, 9, -10, 25, -11, 28, -32, 36, 0, -28, 7, 17, -14, 54, -33, 28, -31, 108, -136, 64, -6, 30, -48, 123, -132, 41, 20, -4, 4, -12, -52, 108, -48, 114, -138, 156, -168, 140, -56, 27, -71, 100, -144, 48, 67, -24, -51, 240, -165, 165, -174, 48, -66, 312, -384, 156, -42, -82, 96, 179, -277, 186

Offset

0,2

Links

Table of n, a(n) for n=0..67.

Crossrefs

First differences of A051027.

Sequence in context: A079081 A199775 A193740 * A327148 A366595 A327237

Adjacent sequences: A111405 A111406 A111407 * A111409 A111410 A111411

Keyword

sign

Author

N. J. A. Sloane, Nov 12 2005

Extensions

Definition corrected by N. J. A. Sloane, Feb 14 2018

Status

approved