A241542 Indices (i.e., value of A000720 = primepi) of primes in A111870.

1, 2, 4, 30, 189, 217, 2225, 3385, 14357, 30802, 31545, 104071, 149689, 1094421, 1319945, 10655462, 23163298, 112228683, 182837804, 203615628, 486570087, 1094330259, 11992433550, 17883926781, 50070452577, 52302956123, 72178455400, 94906079600, 473258870471, 662221289043

Offset: 1

Author

M. F. Hasler, Apr 25 2014

Keywords

• nonn

Links

• Amiram Eldar, Table of n, a(n) for n = 1..32 (calculated using Kim Walisch's primecount)
• Kim Walisch, Fast C++ prime counting function implementation (primecount).

Crossrefs

Cf. A000720, A111870.

Formula

a(n) = A000720(A111870(n)).

Extensions

a(20)-a(30) from Amiram Eldar, Sep 03 2024