A290652 a(n) = PrimePi(A246033(n)) (where PrimePi = A000720).

1, 2, 4, 8, 15, 21, 30, 46, 61, 91, 121, 154, 189, 217, 258, 409, 548, 590, 775, 832, 906, 1227, 1270, 1570, 1847, 2116, 2688, 3607, 3714, 3990, 4483, 4502, 6041, 6045, 8078, 9255, 9833, 12136, 12226, 13208, 14356, 16964, 17511, 18858, 18974, 20476, 23489

Offset: 1

Author

Rémy Sigrist, Aug 08 2017

Keywords

• nonn

Examples

			A246033(42) = 187477 = prime(16964), hence a(42) = 16964.
		

Crossrefs

Cf. A000720, A246033.