A290465 a(n) = A006561(n) - A290447(n).

0, 0, 0, 0, 0, -2, 0, -21, 2, -39, 30, -144, 88, -118, 176, -187, 374, -731, 651, -194, 1013, -89, 1605, -1404, 2327, 325, 3315, 695, 4627, -5271, 6215, 2050, 8093, 3091, 10411, -161, 13392, 6187, 16748, 8140, 20833, -4072, 25480, 13633, 30634, 17212, 36806, 9537, 43478, 25716, 51266, 31113, 60168

Offset: 1

Author

N. J. A. Sloane, Aug 09 2017

Keywords

• sign

Comments

A006561 and A290447 are closely related problems. The former is well-understood, while the latter is at present a mystery.

Crossrefs

Cf. A006561, A290447, A290461.