A188598 - OEIS

A188598

Numbers k such that d(k-1) > d(k) > d(k+1) where d(k) is the number of divisors of k.

46, 81, 82, 106, 166, 225, 226, 261, 262, 273, 316, 325, 346, 358, 385, 406, 436, 441, 442, 465, 466, 477, 478, 496, 513, 556, 561, 562, 568, 586, 595, 596, 621, 625, 628, 651, 652, 676, 705, 715, 716, 796, 801, 826, 837, 838, 856, 861, 862, 885, 886, 892, 897, 916, 925, 946, 976, 981, 982

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OFFSET

1,1

COMMENTS

A000005(a(n)-1) > A000005(a(n)) > A000005(a(n)+1).

LINKS

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

MATHEMATICA

Select[Range[2, 1000], DivisorSigma[0, # - 1] > DivisorSigma[0, #] > DivisorSigma[0, # + 1] &] (* T. D. Noe, Apr 05 2011 *)

CROSSREFS

Cf. A000005, A188631, A075029.

Sequence in context: A245372 A020351 A113691 * A363049 A057454 A260278