login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A075035 Numbers n such that tau(n) >= tau(n+1) >= tau(n+2) >= tau(n+3) where tau(n) = number of divisors of n. 4
20, 32, 44, 56, 80, 84, 92, 104, 116, 140, 170, 176, 200, 212, 216, 224, 230, 242, 260, 296, 300, 324, 332, 344, 374, 380, 392, 434, 440, 444, 464, 476, 500, 506, 512, 560, 594, 602, 608, 620, 632, 644, 650, 696, 704, 714, 715, 716, 740, 776, 800, 804, 836 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..10000

MATHEMATICA

Position[Partition[DivisorSigma[0, Range[900]], 4, 1], _?(Max[ Differences[ #]]< 1&), 1, Heads->False]//Flatten (* Harvey P. Dale, Sep 05 2019 *)

PROG

(Python)

from sympy import divisor_count as tau

[n for n in range(1, 901) if tau(n) >= tau(n+1) >= tau(n+2) >= tau(n+3)] # Karl V. Keller, Jr., Jul 10 2020

CROSSREFS

Cf. A075032, A075033, A075034.

Sequence in context: A218793 A116131 A212050 * A032352 A333729 A183048

Adjacent sequences:  A075032 A075033 A075034 * A075036 A075037 A075038

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Sep 02 2002

EXTENSIONS

More terms from Benoit Cloitre, Sep 07 2002

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 20 18:08 EDT 2021. Contains 343135 sequences. (Running on oeis4.)