A146077 - OEIS

A146077

Numbers n such that gcd(n, 2^n-2) does not equal the least prime factor of n.

28, 35, 45, 55, 70, 77, 95, 105, 112, 115, 119, 143, 153, 154, 155, 161, 165, 175, 186, 187, 196, 203, 209, 215, 221, 225, 231, 235, 238, 247, 253, 275, 276, 280, 285, 287, 295, 299, 319, 322, 323, 325, 329, 335, 341, 345, 355, 364, 371, 377, 385, 391, 395

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

OFFSET

1,1

COMMENTS

Also, positive integers n where A159353(n) differs from A032742(n).

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

MATHEMATICA

Select[Range[400], GCD[#, 2^#-2]!=FactorInteger[#][[1, 1]]&] (* Harvey P. Dale, Dec 14 2015 *)

CROSSREFS

Cf. A159353, A032742.

Sequence in context: A214470 A055576 A281916 * A260637 A143186 A101421