OFFSET
1,2
COMMENTS
Inverse of the permutation of the natural numbers given in A111273.
LINKS
Donovan Johnson, Table of n, a(n) for n = 1..10000
EXAMPLE
A111273(15) = 8, hence a(8) = 15.
CROSSREFS
KEYWORD
nonn
AUTHOR
Klaus Brockhaus, Nov 03 2005
STATUS
approved