OFFSET
1,2
LINKS
Paolo P. Lava, Table of n, a(n) for n = 1..1000
EXAMPLE
12 has 6 positive divisors. 1,5,7,11,13,17,19,23,25...is the sequence of positive integers which are coprime to 12. 17 is the 6th of these integers, so a(12) = 17.
CROSSREFS
KEYWORD
nonn
AUTHOR
Leroy Quet, Aug 18 2006
EXTENSIONS
Extended by Ray Chandler, Aug 22 2006
STATUS
approved