cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A064674 Number of primes q such that phiter(q)=n where phiter(n)=A064415(n).

Original entry on oeis.org

0, 2, 2, 3, 6, 12, 23, 46, 94, 198, 424, 854, 1859, 3884, 8362, 17837, 38977, 84188, 183167, 398685, 874078
Offset: 0

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Author

Christian WEINSBERG (cweinsbe(AT)fr.packardbell.org), Oct 10 2001

Keywords

Comments

For n>1, a(n) is the number of primes in class n of the Phi iteration. See A003434 and A058812. [From T. D. Noe, Nov 05 2008]

Crossrefs

Cf. A000010, A003434, A064415, A064416.

Extensions

a(12)-a(16) from T. D. Noe, Nov 05 2008
a(17)-a(20) from Sean A. Irvine, Jul 22 2023

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