login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A096738 Numbers n such that A096736(n) = (n*tau(n)-1)/(tau(n)-1). 3
2, 3, 5, 7, 9, 10, 11, 13, 17, 19, 22, 23, 25, 29, 31, 34, 37, 41, 43, 46, 47, 49, 53, 55, 58, 59, 61, 67, 71, 73, 76, 78, 79, 81, 82, 83, 85, 89, 91, 94, 97, 101, 103, 106, 107, 109, 113, 115, 116, 118, 121, 127, 131, 133, 137, 139, 142, 145, 149, 151, 157, 163 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

(a(n)*tau(a(n))-1) mod (tau(a(n))-1) = 0;

primes are a subsequence.

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..1000

MATHEMATICA

Select[Range[2, 500], (#*DivisorSigma[0, #] - 1)/(DivisorSigma[0, #] - 1) == Floor[(#*DivisorSigma[0, #] - 1)/(DivisorSigma[0, #] - 1)] &] (* G. C. Greubel, Nov 28 2016 *)

CROSSREFS

Cf. A000040.

Sequence in context: A196499 A035061 A302403 * A167857 A117284 A137377

Adjacent sequences:  A096735 A096736 A096737 * A096739 A096740 A096741

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Jul 06 2004

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified August 15 16:57 EDT 2022. Contains 356148 sequences. (Running on oeis4.)