OFFSET
1,1
COMMENTS
k is in this sequence iff 1) k is divisible by 2 or 5 and 2) k is also divisible by some prime other than 2 and 5. Contains the numbers that are in neither A003592 nor A045572.
The asymptotic density of this sequence is 3/5. - Amiram Eldar, Mar 26 2021
LINKS
Michael De Vlieger, Table of n, a(n) for n = 1..10000
EXAMPLE
22 is a member because 1/22 = .045454545..., which has a 0 before the repeating 45.
MATHEMATICA
f[n_, lim_] := Block[{g, a}, g[x_] := First /@ FactorInteger@ x; a = g@ n; Select[Range@ lim, And[1 < GCD[#, n] < #, Length@ Complement[g@ #, a] >= 1] &]]; f[10, 134] (* Michael De Vlieger, Jun 20 2015 *)
CROSSREFS
KEYWORD
base,easy,nonn
AUTHOR
David Wasserman, Apr 07 2005
STATUS
approved