A135048 Indices of primes with digit product = 3.

2, 6, 11, 30, 32, 64, 1346, 1349, 1367, 10715, 12253, 26886, 733412, 733420, 733533, 734596, 6363182, 6363183, 6363289, 7437658, 503193257, 503193259, 503279746, 504057767, 1346029458, 4555878955, 12238593622, 1035905650780, 309353882444942, 2907021742443975

Offset: 1

Author

Zak Seidov, Feb 11 2008

Keywords

• nonn
• base

Comments

The corresponding primes are in A107689.

Links

• Amiram Eldar, Table of n, a(n) for n = 1..37 (calculated using Kim Walisch's primecount)
• Kim Walisch, Fast C++ prime counting function implementation (primecount).

Crossrefs

Cf. A107611, A107612, A107689.

Formula

a(n) = primepi(A107689(n)).

Extensions

a(26)-a(30) from Amiram Eldar, Sep 06 2024