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A030636 Numbers with 18 divisors. 10
180, 252, 288, 300, 396, 450, 468, 588, 612, 684, 700, 768, 800, 828, 882, 972, 980, 1044, 1100, 1116, 1280, 1300, 1332, 1452, 1476, 1548, 1568, 1575, 1692, 1700, 1792, 1900, 1908, 2028, 2124, 2156, 2178, 2196, 2205, 2300, 2412, 2420, 2450 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Numbers of the form p^17, p*q^8 (A179668), p*q^2*r^2 (A179643) or p^2*q^5 (A179646), where p, q and r are distinct primes. - R. J. Mathar, Mar 01 2010
LINKS
MATHEMATICA
Select[Range[2500], DivisorSigma[0, #]==18&] (* Harvey P. Dale, Feb 01 2011 *)
PROG
(PARI) is(n)=numdiv(n)==18 \\ Charles R Greathouse IV, Jun 19 2016
CROSSREFS
Cf. A030635 (17 divs), A030637 (19 divs).
Sequence in context: A364976 A289056 A309380 * A350372 A179643 A160134
KEYWORD
nonn
AUTHOR
EXTENSIONS
882 inserted by N. J. A. Sloane, Mar 26 2007
STATUS
approved

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Last modified March 28 22:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)