This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A073413 Numbers n such that number of divisors of n divides S(n), the Kempner function A002034. 3
 1, 2, 8, 9, 18, 45, 128, 243, 486, 625, 1215, 1250, 1701, 1875, 2673, 3750, 4375, 5000, 6561, 6875, 8125, 8750, 10625, 11875, 13122, 13125, 13750, 16250, 16875, 20625, 21250, 23750, 24375, 31875, 32768, 32805, 35625, 45927, 48125, 56875, 72171, 74375, 83125 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS MATHEMATICA S[n_] := Block[{k = 1}, While[ ! IntegerQ[k!/n], k++ ]; k]; Do[ If[ IntegerQ[ S[n]/DivisorSigma[0, n]], Print[n]], {n, 1, 3000}] CROSSREFS Cf. A000005, A002034, A073331, A073535. Sequence in context: A126160 A118962 A096033 * A046681 A259672 A163619 Adjacent sequences:  A073410 A073411 A073412 * A073414 A073415 A073416 KEYWORD nonn AUTHOR Jason Earls, Aug 23 2002 EXTENSIONS More terms from Robert G. Wilson v, Aug 25 2002 More terms from Amiram Eldar, Jan 28 2019 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.

Last modified October 15 23:54 EDT 2019. Contains 328038 sequences. (Running on oeis4.)