OFFSET
1,1
COMMENTS
For numbers n of the form 10k, of the form 10k+5 with a zero somewhere, and those using all 10 digits, a(n) = 0.
Are there numbers using 8 of the 9 nonzero digits for which a(n) is nonzero? If so, what is the smallest such number?
LINKS
Michel Marcus, Table of n, a(n) for n = 1..1000
PROG
(PARI) a(n) = {if (! (n % 10), return (0)); my(dn = Set(digits(n)), m = 2*n); if (#dn == 10, return (0)); if (!(n % 5) && vecsearch(dn, 0), return (0)); while(#setintersect(Set(digits(m)), dn), m += n); m; } \\ Michel Marcus, Aug 04 2017
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Amarnath Murthy, Aug 29 2002
EXTENSIONS
a(24) and a(49) corrected by Michel Marcus, Aug 04 2017
STATUS
approved