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

1,4

Comments

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

Links

Table of n, a(n) for n=1..68.

Crossrefs

Cf. A000720.

Sequence in context: A232748 A308936 A187737 * A307294 A280471 A172266

Adjacent sequences: A109398 A109399 A109400 * A109402 A109403 A109404

Keyword

nonn

Author

Reinhard Zumkeller, Jun 27 2005

Status

approved