OFFSET
1,1
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000 (terms 1..1000 from Donovan Johnson)
Max Alekseyev, PARI/GP Scripts for Miscellaneous Math Problems (invphi.gp).
EXAMPLE
For n=5: invphi(4*11) = [69,92,138], a(5) = 3.
MAPLE
[seq(nops(invphi(4*ithprime(i))), i=1..128)];
PROG
(PARI) a(n) = invphiNum(4*prime(n)); \\ Amiram Eldar, Nov 07 2024, using Max Alekseyev's invphi.gp
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, May 30 2002
STATUS
approved