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 A173149 Numbers n such that max(tau(n),tau(n+1),tau(n+2))- min(tau(n),tau(n+1),tau(n+2)) = 1. 1
 1, 2, 3, 8, 14, 25, 121, 841, 1442, 6241, 8281, 16641, 20164, 24962, 26894, 28561, 46225, 55225, 58564, 65534, 67081, 73441, 93025, 104329, 110888, 116281, 143641, 149768, 155236, 212521, 235225, 252003, 271441, 279841, 284089, 293762, 293763 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Amiram Eldar, Table of n, a(n) for n = 1..1000 EXAMPLE For n = 1, max(tau(1),tau(2),tau(3)) - min(tau(1),tau(2),tau(3)) = max(1,2,2) - min(1,2,2) = 1. For n = 121, max(tau(121),tau(122),tau(123)) - min(tau(121),tau(122),tau(123)) = max(1,2,2) - min(1,2,2) = 1 MAPLE with(numtheory):for n from 1 to 1500000 do; if max(tau(n), tau(n+1), tau(n+2))- min(tau(n), tau(n+1), tau(n+2))= 1 then print(n); else fi ; od; MATHEMATICA Select[Range[10^6], Max[(d = DivisorSigma[0, #+{0, 1, 2}])] - Min[d] == 1 &] (* Amiram Eldar, Aug 14 2019 *) CROSSREFS Sequence in context: A022951 A247124 A171237 * A128305 A328881 A298349 Adjacent sequences: A173146 A173147 A173148 * A173150 A173151 A173152 KEYWORD nonn AUTHOR Michel Lagneau, Feb 11 2010, Feb 13 2010 STATUS approved

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Last modified April 12 22:48 EDT 2024. Contains 371639 sequences. (Running on oeis4.)