A382719 Numerator of Sum_{i=1..n} 1/A348626(i)^2.

0, 1, 1, 3, 31, 35, 1751, 2351, 115247, 416333389, 107225418168983, 562904175532925088592367, 1857180475556752726157213791943527783, 424594887903818740281781489141947299537771799837674380866823, 27616236678198713245845367246922973802897093015095664467076756280985616142084296233915021926355087

Offset: 0

Author

N. J. A. Sloane, Apr 21 2025

Keywords

• nonn
• frac

Comments

The denominators are given in A348640.

Examples

			The first few fractions are 0, 1/4, 1/2, 3/4, 31/36, 35/36, 1751/1764, 2351/2352, 115247/115248, 416333389/416333400, ...
		

Crossrefs

Cf. A348626, A348640, A348641.

Formula

a(n) = A348640(n) - A348641(n).