OFFSET
1,2
PROG
(PARI) is(n) = my(d=vecsort(digits(n, 12))); #setintersect(d, vector(#d))==#setintersect(d, vector(#d, x, 2)) \\ Felix Fröhlich, Jun 26 2021
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
STATUS
approved