login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A175754 Numbers with 48 divisors. 3
2520, 3360, 3780, 3960, 4200, 4320, 4620, 4680, 5280, 5400, 5460, 5544, 5760, 5880, 5940, 6048, 6120, 6240, 6552, 6600, 6840, 6930, 7020, 7140, 7392, 7800, 7980, 8064, 8160, 8190, 8280, 8316, 8568, 8580, 8736, 9000, 9120, 9180, 9450, 9504, 9576, 9600 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Numbers of the forms p^47, p^23*q^1, p^15*q^2, p^11*q^3, p^7*q^5, p^3*q^3*r^2, p^7*q^2*r^1, p^11*q^1*r^1, p^5*q^3*r^1, p^5*q^1*r^1*s^1, p^3*q^2*r^1*s^1 and p^2*q^1*r^1*s^1*t^1, where p, q, r, s and t are distinct primes.

LINKS

T. D. Noe, Table of n, a(n) for n = 1..1000

OEIS Wiki, Index entries for number of divisors

FORMULA

A000005(a(n))=48.

MATHEMATICA

Select[Range[20000], DivisorSigma[0, #]==48&] (* Vladimir Joseph Stephan Orlovsky, May 06 2011 *)

PROG

(PARI) is(n)=numdiv(n)==48 \\ Charles R Greathouse IV, Jun 19 2016

CROSSREFS

Cf. A175752, A175753, A139575.

Sequence in context: A166931 A131662 A068352 * A068547 A094515 A179700

Adjacent sequences:  A175751 A175752 A175753 * A175755 A175756 A175757

KEYWORD

nonn

AUTHOR

Jaroslav Krizek, Aug 27 2010

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 October 13 21:59 EDT 2019. Contains 327981 sequences. (Running on oeis4.)