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A018130
Powers of fifth root of 6 rounded to nearest integer.
1
1, 1, 2, 3, 4, 6, 9, 12, 18, 25, 36, 52, 74, 105, 151, 216, 309, 442, 633, 906, 1296, 1855, 2654, 3797, 5434, 7776, 11127, 15923, 22785, 32604, 46656, 66763, 95536, 136709, 195627, 279936, 400580, 573217, 820256
OFFSET
0,3
MATHEMATICA
Round[(6^(1/5))^Range[0, 100]] (* Paolo Xausa, Jun 23 2024 *)
PROG
(Python)
from gmpy2 import iroot_rem
def A018130(n):
i, j = iroot_rem(6**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. A011091.
Sequence in context: A309591 A018669 A138857 * A160993 A171826 A000792
KEYWORD
nonn
STATUS
approved