A109401 Number of primes in the first n terms of A109400.

0, 1, 1, 2, 3, 4, 4, 5, 6, 7, 8, 9, 9, 10, 11, 11, 12, 13, 14, 15, 15, 16, 17, 17, 18, 19, 20, 21, 22, 23, 23, 24, 25, 25, 26, 26, 27, 28, 29, 30, 31, 32, 32, 33, 34, 34, 35, 35, 36, 37, 38, 39, 40, 41, 42, 43, 43, 44, 45, 45, 46, 46, 47, 47, 48, 49, 50, 51

Offset: 1

Author

Reinhard Zumkeller, Jun 27 2005

Keywords

• nonn

Comments

a(n) = Sum(A010051(A109400(m)): 1<=m<=n).

Crossrefs

Cf. A000720.