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A030634 Numbers with 16 divisors. 18
120, 168, 210, 216, 264, 270, 280, 312, 330, 378, 384, 390, 408, 440, 456, 462, 510, 520, 546, 552, 570, 594, 616, 640, 680, 690, 696, 702, 714, 728, 744, 750, 760, 770, 798, 858, 870, 888, 896, 910, 918, 920, 930, 945, 952, 966, 984, 1000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Numbers of the form p^15 (subset of A010803), p*q^7, p*q*r^3 or p^3*q^3, or p*q*r*s, where p, q, r and s are distinct primes. [From R. J. Mathar, Mar 01 2010]

LINKS

R. J. Mathar, Table of n, a(n) for n = 1..1000

MATHEMATICA

Select[Range[3000], DivisorSigma[0, #]==16&] (* Vladimir Joseph Stephan Orlovsky, May 05 2011 *)

CROSSREFS

Cf. A030631, A030632, A030633.

Sequence in context: A179642 A099832 A111399 * A189975 A232461 A090782

Adjacent sequences:  A030631 A030632 A030633 * A030635 A030636 A030637

KEYWORD

nonn

AUTHOR

Jeff Burch

STATUS

approved

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Last modified August 1 19:36 EDT 2014. Contains 245137 sequences.