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A071631
Number of terms in the set InvPhi(16*prime(n)), where prime(n) is the n-th prime.
4
7, 11, 10, 6, 8, 4, 5, 0, 5, 8, 0, 6, 5, 4, 0, 5, 0, 2, 4, 3, 4, 4, 5, 5, 6, 3, 0, 3, 0, 5, 4, 8, 3, 4, 3, 2, 0, 6, 0, 5, 8, 2, 5, 6, 0, 4, 0, 0, 0, 0, 5, 8, 0, 5, 0, 0, 3, 2, 4, 5, 0, 5, 4, 0, 2, 0, 2, 2, 3, 0, 0, 5, 0, 4, 0, 0, 0, 2, 3, 4, 5, 2, 8, 4, 0, 5, 3, 0, 0, 0, 0, 3, 6, 8, 4, 0, 8, 0, 2, 0, 2, 3, 0, 0
OFFSET
1,1
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000 (terms 1..1000 from Donovan Johnson)
EXAMPLE
invphi(16*29) = {699,885,932,944,1180,1398,1416,1770} so a(10) = 8.
MAPLE
[seq(nops(invphi(16*ithprime(i))), i=1..128)];
PROG
(PARI) a(n) = invphiNum(16*prime(n)); \\ Amiram Eldar, Nov 07 2024, using Max Alekseyev's invphi.gp
KEYWORD
nonn
AUTHOR
Labos Elemer, May 30 2002
STATUS
approved