A086337 - OEIS

A086337

Numbers n such that n, n-1 and n-2 have the same prime signature.

35, 87, 95, 143, 203, 215, 219, 303, 395, 447, 635, 699, 923, 1043, 1139, 1263, 1311, 1347, 1403, 1643, 1763, 1839, 1887, 1895, 1943, 1983, 2015, 2103, 2183, 2219, 2307, 2363, 2435, 2463, 2519, 2643, 2667, 2723, 2735, 3099, 3387, 3603, 3695, 3731, 3867

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Giovanni Resta, Table of n, a(n) for n = 1..10000

MATHEMATICA

sig[n_] := If[n == 1, {}, Last /@ FactorInteger[n]]; Select[Range[3902], sig[#] == sig[# - 1] == sig[# - 2] &] (* Giovanni Resta, Aug 14 2017 *)

CROSSREFS

Cf. A083793.

Sequence in context: A119691 A220007 A115393 * A118631 A347140 A220041

Adjacent sequences: A086334 A086335 A086336 * A086338 A086339 A086340

KEYWORD

nonn

AUTHOR

Robert G. Wilson v, Sep 01 2003

STATUS

approved