A018157 Powers of fifth root of 15 rounded to nearest integer.

1, 2, 3, 5, 9, 15, 26, 44, 76, 131, 225, 387, 665, 1142, 1964, 3375, 5801, 9970, 17137, 29454, 50625, 87013, 149555, 257051, 441813, 759375, 1305192, 2243328, 3855769, 6627188, 11390625, 19577886, 33649922

Offset

0,2

Links

Paolo Xausa, Table of n, a(n) for n = 0..1000

Mathematica

Round[(15^(1/5))^Range[0, 50]] (* Paolo Xausa, Jul 01 2024 *)

Prog

(Python)
from gmpy2 import iroot_rem
def A018157(n):
    i, j = iroot_rem(15**n, 5)
    return int(i)+int(j<<5>=10*i*((i*((i*(i+1)<<1)+1)<<2)+1)+1) # Chai Wah Wu, Jun 20 2024

Crossrefs

Cf. A011100.

Sequence in context: A096816 A220127 A286887 * A228644 A003065 A239909

Adjacent sequences: A018154 A018155 A018156 * A018158 A018159 A018160

Keyword

nonn

Author

N. J. A. Sloane

Status

approved