4,2

Is this ever zero? If not, this would prove that A329492(11) = -1, and that A328882 is never -11. (-11 is the first negative open case.)

Robert Israel, Table of n, a(n) for n = 4..10000

f:= proc(n) convert(convert(2^n-11, base, 10), `+`)-n end proc:

map(f, [$4..100]); # Robert Israel, Nov 17 2019

Cf. A328882, A329002, A329492.

Sequence in context: A275247 A293440 A237121 * A139821 A248972 A077563

Adjacent sequences: A329490 A329491 A329492 * A329494 A329495 A329496

sign,base

N. J. A. Sloane, Nov 16 2019

approved