OFFSET
1,2
COMMENTS
All the terms are multiples of 4 (A008586).
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..14400 (terms below 10!)
Wikipedia, Factorial number system.
EXAMPLE
4 is a term since its factorial-base presentation, 20, has only even digits.
16 is a term since its factorial-base presentation, 220, has only even digits.
MATHEMATICA
max = 7; fctBaseDigits[n_] := IntegerDigits[n, MixedRadix[Range[max, 2, -1]]]; Select[Range[0, max!, 2], AllTrue[fctBaseDigits[#], EvenQ] &]
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Amiram Eldar, Feb 24 2022
STATUS
approved