A055064 a(n) = A004125(2^n) = A004125(2^n-1).

0, 1, 8, 36, 167, 693, 2849, 11459, 46244, 185622, 743759, 2974937, 11907026, 47643438, 190606963, 762449101, 3049917900, 12199777048, 48799551822, 195198666492, 780796575104, 3123189865122, 12492766610068, 49971069327602, 199884317492186, 799537344955292

Offset: 1

Author

David W. Wilson, Jun 12 2000

Keywords

• nonn

Links

• Chai Wah Wu, Table of n, a(n) for n = 1..77

Crossrefs

Cf. A004125, A006516, A120444.

Programs

Python

from math import isqrt
def A055064(n): return ((m:=1<>1) # Chai Wah Wu, Oct 22 2023

Formula

a(n) >= A006516(n-1). - R. J. Mathar, Apr 04 2012