OFFSET
1,2
EXAMPLE
12 has 6 positive divisors. 1,5,7,11,13,17,19,23,25,29,31,35,37,...is the sequence of positive integers which are coprime to 6. 35 is the 12th of these integers, so a(12) = 35.
MATHEMATICA
Table[Select[Range[300], CoprimeQ[#, DivisorSigma[0, n]]&][[n]], {n, 70}] (* Harvey P. Dale, Aug 29 2023 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Leroy Quet, Aug 18 2006
EXTENSIONS
Extended by Ray Chandler, Aug 22 2006
STATUS
approved