|
| |
|
|
A076774
|
|
2-nadirs of sigma: n such that sigma(n-2) > sigma(n-1) > sigma(n) < sigma(n+1) < sigma(n+2).
|
|
0
| |
|
|
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; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
COMMENTS
| 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).
|
|
|
MATHEMATICA
| Select[Range[3, 10^6], DivisorSigma[1, # - 2] > DivisorSigma[1, # - 1] > DivisorSigma[1, # ] < DivisorSigma[1, # + 1] < DivisorSigma[1, # + 2] &]
|
|
|
CROSSREFS
| Sequence in context: A205232 A121669 A043621 * A094413 A093790 A001381
Adjacent sequences: A076771 A076772 A076773 * A076775 A076776 A076777
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Nov 14 2002
|
| |
|
|
