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A175116 A positive integer k is included if d(k) = d(k+1) * d(k+2), where d(k) is the number of divisors of k. 4
96, 105, 165, 216, 280, 315, 345, 357, 408, 465, 522, 552, 561, 616, 624, 640, 696, 744, 760, 837, 861, 885, 920, 924, 945, 990, 1032, 1056, 1128, 1185, 1281, 1302, 1368, 1386, 1416, 1464, 1560, 1640, 1785, 1830, 1860, 1905, 1950, 2037, 2142, 2184, 2296 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Terms calculated by M. F. Hasler.

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000

MATHEMATICA

Transpose[Select[Partition[Range[3000], 3, 1], DivisorSigma[0, First[#]]== DivisorSigma[0, Last[#]]DivisorSigma[0, #[[2]]]&]][[1]]  (* Harvey P. Dale, Apr 08 2011 *)

CROSSREFS

Cf. A000005, A175115, A145470.

Sequence in context: A181470 A306104 A257411 * A153484 A060660 A258748

Adjacent sequences:  A175113 A175114 A175115 * A175117 A175118 A175119

KEYWORD

nonn

AUTHOR

Leroy Quet, Feb 13 2010

STATUS

approved

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Last modified November 20 14:54 EST 2019. Contains 329337 sequences. (Running on oeis4.)