OFFSET
1,1
COMMENTS
Up to 10^12, only 3 terms admit two representations, namely 22791, 410871 and 1675365. - Giovanni Resta, Jul 19 2015
LINKS
Giovanni Resta, Table of n, a(n) for n = 1..500
EXAMPLE
153 = 6*21 + 6 + 21.
351 = 15*21 + 15 + 21.
406 = 10*36 + 10 + 36.
CROSSREFS
KEYWORD
nonn
AUTHOR
Alex Ratushnyak, Jul 04 2015
STATUS
approved