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Search: id:A076774
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| A076774 |
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2-nadirs of sigma: n such that sigma(n-2) > sigma(n-1) > sigma(n) < sigma(n+1) < sigma(n+2). |
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1
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| 17254, 27754, 68914, 69686, 82774, 92366, 111266, 133706, 152426, 194426, 267994, 277586, 359974, 387694, 389726, 429274, 448174, 452726, 457766, 471626, 474146, 522026, 527066, 531334, 554126, 567386, 595594, 610226, 674246, 674974
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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I call n a "k-nadir" (or nadir of depth k) of the arithmetical function f if n satisfies f(n-k) > ... > f(n-1) > f(n) < f(n+1) < ... < f(n+k).
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MATHEMATICA
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Select[Range[3, 10^6], DivisorSigma[1, # - 2] > DivisorSigma[1, # - 1] > DivisorSigma[1, # ] < DivisorSigma[1, # + 1] < DivisorSigma[1, # + 2] &]
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CROSSREFS
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Sequence in context: A035922 A121669 A043621 this_sequence A094413 A093790 A001381
Adjacent sequences: A076771 A076772 A076773 this_sequence A076775 A076776 A076777
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KEYWORD
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nonn
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AUTHOR
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Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Nov 14 2002
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