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A073566 Numbers n such that n, n+1 and n+2 have the same number of anti-divisors. 0
19, 74, 90, 102, 148, 187, 204, 212, 213, 231, 232, 233, 328, 329, 351, 457, 469, 519, 546, 547, 555, 573, 756, 859, 868, 869, 870, 879, 980, 981, 991, 1025, 1080, 1081, 1096, 1120, 1121, 1122, 1132, 1158, 1211, 1413, 1420, 1430, 1431, 1441, 1467, 1482 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

See A066272 for definition of anti-divisor.

LINKS

Table of n, a(n) for n=1..48.

MATHEMATICA

at[n_] := Count[Flatten[Quotient[#, Rest[Select[Divisors[#], OddQ]]] & /@ (2 n + Range[-1, 1])], Except[1]]; Select[Range[1485], at[#] == at[# + 1] == at[# + 2] &] (* Jayanta Basu, Jul 01 2013 *)

CROSSREFS

Cf. A066272.

Sequence in context: A047979 A290241 A159997 * A244631 A304513 A041698

Adjacent sequences:  A073563 A073564 A073565 * A073567 A073568 A073569

KEYWORD

nonn

AUTHOR

Jason Earls, Aug 31 2002

STATUS

approved

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Last modified January 19 16:14 EST 2019. Contains 319307 sequences. (Running on oeis4.)