OFFSET
1,1
COMMENTS
Maple implementation: see A030513.
Numbers of the form p^23, p^2*q^7, p*q^2*r^3 (like 360, 504), p*q*r^5 (like 480, 672), p*q*r*s^2 (like 420, 660), p^3*q^5 (like 864) or p*q^11, where p, q, r and s are distinct primes. - R. J. Mathar, Mar 01 2010
LINKS
T. D. Noe, Table of n, a(n) for n = 1..1000
FORMULA
A000005(a(n))=24.
MATHEMATICA
Select[Range[3000], DivisorSigma[0, #]==24&] (* Vladimir Joseph Stephan Orlovsky, May 05 2011 *)
PROG
(PARI) is(n)=numdiv(n)==24 \\ Charles R Greathouse IV, Jun 19 2016
CROSSREFS
KEYWORD
nonn
AUTHOR
R. J. Mathar, Apr 22 2008
STATUS
approved