A136374 a(n) = (A128677(n) - 1)/(2*A000040(n)).

3, 4, 2, 1, 3, 1224, 551, 1, 697, 66, 60, 31, 12, 7, 24641820, 3343240, 122610, 134, 4, 101, 80, 1, 979, 518, 1414

Offset: 2

Author

Alexander Adamchuk, Dec 27 2007

Keywords

• nonn
• more

Comments

All terms are integer since for n > 1, p = A000040(n) divides (A128677(n)-1)/2.

Examples

			a(2) = (A128677(2) - 1)/(2*A000040(2)) = (19 - 1)/(2*3) = 3.
		

Crossrefs

Cf. A128677, A127263, A128678, A128679, A128680, A128681, A128682, A128683, A128684, A128685.

Formula

a(n) = (A128677(n) - 1)/(2*A000040(n)).

Extensions

a(16)-a(26) from Max Alekseyev, May 14 2010