A075032 Numbers n such that tau(n) <= tau(n+1) <= tau(n+2) where tau(n) = number of divisors of n.

1, 2, 13, 14, 25, 26, 33, 34, 37, 38, 43, 61, 62, 73, 74, 85, 86, 93, 94, 97, 98, 103, 115, 118, 121, 122, 133, 134, 141, 142, 145, 146, 157, 158, 163, 187, 188, 193, 194, 201, 202, 205, 206, 213, 214, 217, 218, 229, 230, 241, 242, 243, 244, 253, 254, 274, 277

Offset

1,2

Links

Karl V. Keller, Jr., Table of n, a(n) for n = 1..10000

Prog

(Python)
from sympy import divisor_count as tau
[n for n in range(1, 303) if tau(n) <= tau(n+1) <= tau(n+2)] # Karl V. Keller, Jr., Jul 10 2020

Crossrefs

Cf. A000005, A075033, A075034, A075035, A005238 (subsequence).

Sequence in context: A335972 A175270 A320339 * A032932 A089019 A015905

Adjacent sequences: A075029 A075030 A075031 * A075033 A075034 A075035

Keyword

nonn

Author

Amarnath Murthy, Sep 02 2002

Extensions

Corrected and extended by Benoit Cloitre, Sep 07 2002

Status

approved