OFFSET
1,1
COMMENTS
The asymptotic density of this sequence is 23/35. - Amiram Eldar, Dec 02 2023
LINKS
Michael De Vlieger, Table of n, a(n) for n = 1..10000
Michael De Vlieger, Diagram showing numbers k in this sequence instead as k mod 70 arranged in rows, labeled and in large black circles, else gray dots if coprime to 70, purple if k = 1, red if k | 70, and gold if rad(k) | 70.
MATHEMATICA
With[{n = 70}, Select[Range[200], And[! CoprimeQ[#, n], ! Divisible[n, Times @@ FactorInteger[#][[All, 1]]]] & ] ]
CROSSREFS
KEYWORD
nonn
AUTHOR
Michael De Vlieger, Apr 04 2023
STATUS
approved