A146952 a(n) = A146950(n)/40.

0, 3, 6, 12, 17, 26, 33, 45, 54, 69, 80, 2, 111, 132, 3, 171, 188, 215, 234, 264, 285, 318, 341, 377, 402, 9, 468, 510, 11, 584, 615, 663, 696, 747, 782, 836, 873, 930, 969, 3, 1070, 1133, 24, 1242, 1287, 1356, 1403, 1475, 1524, 1599, 1650, 1728, 1781, 38

Offset: 1

Author

Paul Curtz, Nov 03 2008

Keywords

• nonn

Comments

A061047(n) is divisible by 10 iff n is 3 or 7 mod 10. In this case, A061047(n) is also divisible by 40. - Andrew Howroyd, Jan 03 2020

Links

• Andrew Howroyd, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A061047, A146950.

Programs

PARI

a(n)={my(t=5*n + 3 - n%2); numerator(1/49 - 1/t^2)/40} \\ Andrew Howroyd, Jan 03 2020

Formula

a(n) = A061047(5*n + 3 - (n mod 2)). - Andrew Howroyd, Jan 03 2020

Extensions

Offset corrected and terms a(11) and beyond from Andrew Howroyd, Jan 03 2020