A138836 - OEIS

A138836

Non-Mersenne numbers A001348.

1, 2, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70

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OFFSET

1,2

COMMENTS

Numbers that are not in A001348.

a(1) to a(2042) equals A133398, then a(2043)=2048 <> A133398(2043)=2047.

LINKS

Table of n, a(n) for n=1..67.

Chai Wah Wu, Algorithms for complementary sequences, arXiv:2409.05844 [math.NT], 2024.

PROG

(Python)

from sympy import primepi, prime