A145196 Partial sums of number of primes < n-th-prime p such that p+4 is prime.

0, 0, 1, 2, 4, 6, 9, 12, 16, 20, 24, 28, 33, 38, 44, 50, 56, 62, 68, 75, 82, 89, 97, 105, 113, 122, 131, 141, 151, 162, 173, 185, 197, 209, 221, 233, 245, 257, 270, 283, 296, 309, 322, 335, 349, 363, 377, 391, 406, 421, 437, 453, 469, 485, 501, 517, 533, 549, 565

Offset

1,4

Links

Table of n, a(n) for n=1..59.

Formula

a(n) = sum_{i=1..n} A139789(i). [From R. J. Mathar, Nov 03 2008]

Crossrefs

Cf. A139789.

Sequence in context: A145801 A033291 A105434 * A061536 A095114 A062048

Adjacent sequences: A145193 A145194 A145195 * A145197 A145198 A145199

Keyword

nonn

Author

Giovanni Teofilatto, Oct 04 2008

Extensions

More terms from R. J. Mathar, Nov 03 2008

Status

approved