A071630 Number of terms in the set InvPhi(8*prime(n)), where prime(n) is the n-th prime.

6, 10, 9, 3, 6, 3, 2, 0, 4, 6, 0, 3, 4, 3, 0, 4, 0, 0, 3, 2, 3, 3, 4, 4, 3, 2, 0, 2, 0, 4, 3, 6, 2, 3, 2, 0, 0, 3, 0, 4, 6, 0, 4, 3, 0, 3, 0, 0, 0, 0, 4, 6, 0, 4, 0, 0, 2, 0, 3, 4, 0, 4, 3, 0, 0, 0, 0, 0, 2, 0, 0, 4, 0, 3, 0, 0, 0, 0, 2, 3, 4, 0, 6, 3, 0, 4, 2, 0, 0, 0, 0, 2, 3, 6, 3, 0, 6, 0, 0, 0, 0, 2, 0, 0

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(8*11) = {89,115,178,184,230,276}, a(5) = 6.

Maple

[seq(nops(invphi(8*ithprime(i))), i=1..128)];

Prog

(PARI) a(n) = invphiNum(8*prime(n)); \\ Amiram Eldar, Nov 07 2024, using Max Alekseyev's invphi.gp

Crossrefs

Cf. A000010, A002202, A005277, A007617, A058888, A071629-A071634.

Sequence in context: A084365 A066135 A070393 * A334937 A003862 A127019

Adjacent sequences: A071627 A071628 A071629 * A071631 A071632 A071633

Keyword

nonn

Author

Labos Elemer, May 30 2002

Status

approved