A172235 n-th partial sum of primes of the form 3*k+1/2+-1/2 minus n-th partial sum of primes of the form 3*m-1.

1, 3, 5, 7, 15, 23, 25, 39, 53, 67, 75, 89, 103, 111, 131, 157, 177, 197, 211, 225, 245, 265, 285, 311, 313, 321, 353, 379, 405, 449, 493, 543, 587, 625, 675, 701, 727, 765, 791, 823, 855, 875, 901, 921, 959

Offset

1,2

Links

Table of n, a(n) for n=1..45.

Formula

a(n) = A172113(n) - A172188(n).

Example

a(1) = (3*1+1/2-1/2)-(3*1-1) = 1;
a(2) = (3+3*2+1/2+1/2)-(2+3*2-1) = 3.

Crossrefs

Cf. A172188, A172113.

Partial sums of A171715.

Sequence in context: A194360 A057743 A071169 * A163979 A124248 A029514

Adjacent sequences: A172232 A172233 A172234 * A172236 A172237 A172238

Keyword

nonn

Author

Juri-Stepan Gerasimov, Feb 01 2010

Extensions

Corrected (453 replaced by 493) by R. J. Mathar, May 22 2010

Status

approved