OFFSET
1,1
LINKS
Reinhard Zumkeller, Table of n, a(n) for n = 1..10000
EXAMPLE
Array begins
1 2 4 7 8 10 12 ...
.3 6 11 15 18 ...
. 9 17 26 33 ...
PROG
(Haskell) cf. A056231.
CROSSREFS
KEYWORD
nonn,nice,easy
AUTHOR
N. J. A. Sloane, E. M. Rains, Aug 22 2000
STATUS
approved