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 A075034 Numbers n such that tau(n) >= tau(n+1) >= tau(n+2) where tau(n) = number of divisors of n. 4
 20, 21, 32, 33, 44, 45, 56, 57, 75, 80, 81, 84, 85, 92, 93, 104, 105, 116, 117, 132, 135, 140, 141, 144, 147, 165, 170, 171, 176, 177, 189, 200, 201, 204, 212, 213, 216, 217, 224, 225, 230, 231, 242, 243, 252, 260, 261, 272, 285, 296, 297, 300, 301, 315, 324 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Karl V. Keller, Jr., Table of n, a(n) for n = 1..10000 MATHEMATICA nn = 400; t = DivisorSigma[0, Range[nn]]; Select[Range[nn-2], t[[#]] >= t[[#+1]] >= t[[#+2]] &] (* Harvey P. Dale, May 24 2012 *) PROG (Python) from sympy import divisor_count as tau [n for n in range(1, 333) if tau(n) >= tau(n+1) >= tau(n+2)] # Karl V. Keller, Jr., Jul 10 2020 CROSSREFS Cf. A000005 (tau), A075032, A075033, A075035. Sequence in context: A118865 A118608 A176241 * A363770 A022110 A041808 Adjacent sequences: A075031 A075032 A075033 * A075035 A075036 A075037 KEYWORD nonn AUTHOR Amarnath Murthy, Sep 02 2002 EXTENSIONS More terms from Benoit Cloitre, Sep 07 2002 STATUS approved

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Last modified September 12 09:23 EDT 2024. Contains 375850 sequences. (Running on oeis4.)