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.

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

Offset: 1

Author

Leroy Quet, Feb 13 2010

Keywords

• nonn

Comments

Terms calculated by M. F. Hasler.

Links

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

Crossrefs

Cf. A000005, A175115, A145470.

Programs

Mathematica

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