OFFSET
1,1
COMMENTS
Numbers of the forms p^41, p^20*q^1, p^13*q^2, p^6*q^5 and p^6*q^2*r^1 (A179703), where p, q, and r 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))=42.
MATHEMATICA
Select[Range[50000], DivisorSigma[0, #]==42&] (* Vladimir Joseph Stephan Orlovsky, May 04 2011 *)
PROG
(PARI) is(n)=numdiv(n)==42 \\ Charles R Greathouse IV, Jun 19 2016
CROSSREFS
KEYWORD
nonn
AUTHOR
Jaroslav Krizek, Aug 27 2010
EXTENSIONS
Extended by T. D. Noe, May 08 2011
STATUS
approved