OFFSET
1,2
COMMENTS
Erich Friedman calls them S-numbers. It was proved that such numbers are infinitely many but their density is 0.
LINKS
Erich Friedman, Problem of the Month, August 2003
EXAMPLE
81 = (8 + 1)^2.
89 = 8 + 9^2.
136 = (1 + 3^2)^2 + 6^2.
264 = 2 + 6 + (4^2)^2.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Kausthub Gudipati, Aug 31 2011
STATUS
approved