OFFSET
1,3
COMMENTS
Right subdiagonal of A074625.
Records values are: 1, 7, 2401, 9604, 21609, 2614689, 21215236, 36324729, 53304601, 338964921, 431642176, 528264256, 1307979556, ... obtained at indices: 1, 3, 6, 12, 18, 30, 60, 210, 288, 384, 534, 630, 732. - Michel Marcus, Dec 22 2013
LINKS
Michel Marcus and Donovan Johnson, Table of n, a(n) for n = 1..3000 (first 800 terms from Michel Marcus)
PROG
(PARI) a(n) = {x = 1; while ((sigma(x) % n) != (n - 1), x++); x; } \\ Michel Marcus, Dec 18 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
Michel Marcus, Dec 18 2013
STATUS
approved