OFFSET
1,1
COMMENTS
A247552(n) is the least number x such that the ratio of the sum of all the cyclic permutations of x, plus the unpermuted number, and x itself is equal to n.
When x is in the sequence, then all multiples of x are there too. The primitive terms, i.e., the terms that are not a multiple of a previous term, are 7, 11, 13, 17, 19, 23, 29, 37, 41, 43, 47, 48, 53, 59, 61, 62, ... Among those, one finds few composites: 48, 62, 93, 180, 675, 961, ...
LINKS
Jens Kruse Andersen, Table of n, a(n) for n = 1..1000
EXAMPLE
A247552(7) is 428571 instead of the more obvious 1111111, so 7 belongs to this sequence.
PROG
(PARI) lista() = my(v = readvec("b247552.txt")); select(x->vecmax(digits(x)) != 1, v, 1);
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Michel Marcus, Sep 24 2014
STATUS
approved