login
A124330
a(n)= ((d(n) mod phi(n)) +1)th positive integer which is coprime to n, where phi(n) is number of positive integers which are <= n and are coprime to n and d(n) is the number of positive divisors of n.
3
1, 1, 1, 3, 3, 1, 3, 1, 5, 1, 3, 7, 3, 11, 8, 11, 3, 1, 3, 17, 8, 9, 3, 1, 4, 9, 7, 15, 3, 1, 3, 13, 7, 9, 6, 29, 3, 9, 7, 21, 3, 29, 3, 15, 13, 9, 3, 31, 4, 17, 7, 15, 3, 25, 6, 19, 7, 9, 3, 47, 3, 9, 11, 15, 6, 29, 3, 13, 7, 27, 3, 37, 3, 9, 13, 13, 5, 29, 3, 27, 8, 9, 3, 43, 6, 9, 7, 19, 3, 47, 5
OFFSET
1,4
LINKS
MATHEMATICA
f[n_] := Block[{k = 0, m = Mod[Length[Divisors[n]], EulerPhi[n]] + 1}, While[m > 0, k++; While[GCD[n, k] > 1, k++ ]; m--; ]; k]; Table[f[n], {n, 100}] (* Ray Chandler, Oct 26 2006 *)
PROG
(PARI) A124330(n) = { my(k=1+(numdiv(n)%eulerphi(n))); for(i=1, oo, if(1==gcd(i, n), k--; if(!k, return(i)))); }; \\ Antti Karttunen, Feb 18 2023
CROSSREFS
KEYWORD
nonn
AUTHOR
Leroy Quet and Ray Chandler, Oct 26 2006
STATUS
approved