OFFSET
1,2
COMMENTS
An Ulam-type sequence - see A002858 for further information.
LINKS
Alois P. Heinz, Table of n, a(n) for n = 1..120
EXAMPLE
a(11) = 55 = 1 + ... + 10 = 10*11/2, because it is the least number >10 with a unique sum of 10 distinct earlier terms.
a(12) = 100 = 1 + ... + 9 + 55 = 10^2, because it is the least number >55 with a unique sum of 10 distinct earlier terms.
MAPLE
# see A183534 for programs.
CROSSREFS
KEYWORD
nonn
AUTHOR
Jonathan Vos Post and Alois P. Heinz, Jan 05 2011
STATUS
approved