A096291 Sum of digits(product of nonzero digits(n^n)).

1, 4, 5, 6, 3, 9, 18, 27, 27, 1, 18, 27, 18, 9, 45, 27, 54, 54, 63, 15, 45, 72, 81, 72, 72, 81, 126, 72, 72, 27, 63, 81, 90, 81, 117, 99, 135, 135, 117, 54, 171, 144, 135, 144, 126, 171, 225, 126, 180, 72, 207, 162, 126, 162, 180, 198, 207, 234, 234, 135, 225, 207, 225, 270

Offset: 1

Author

Jason Earls, Jun 24 2004

Keywords

• base
• easy
• nonn

Comments

Conjecture: a(n) = a(n+1) for infinitely many positive integers. Largest found is n=2577, i.e. sd(pnd(2577^2577)) = sd(pnd(2578^2578)) = 18315.

Crossrefs

Cf. A051801, A007953.