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A075032 Numbers n such that tau(n) <= tau(n+1) <= tau(n+2) where tau(n) = number of divisors of n. 4
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 (list; graph; refs; listen; history; text; internal format)
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: A229908 A335972 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

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Last modified December 8 08:31 EST 2021. Contains 349594 sequences. (Running on oeis4.)