A089646 a(n) = Sum(a(floor(n/p)): p prime and p<=n); a(1) = 1.

1, 1, 2, 2, 3, 4, 5, 5, 6, 7, 8, 9, 10, 11, 13, 13, 14, 16, 17, 18, 20, 21, 22, 23, 24, 25, 26, 27, 28, 32, 33, 33, 35, 36, 38, 41, 42, 43, 45, 46, 47, 51, 52, 53, 56, 57, 58, 59, 60, 62, 64, 65, 66, 69, 71, 72, 74, 75, 76, 82, 83, 84, 87, 87, 89, 93, 94, 95, 97, 101, 102, 106

Offset: 1

Author

Reinhard Zumkeller, Jan 02 2004

Keywords

• nonn

Examples

			a(10) = a([10/2])+a([10/3])+a([10/5])+a([10/7]) =
a(5)+a(3)+a(2)+a(1) = (a([5/2])+a([5/3])+a([5/5])) + (a([3/2])+a([3/3])) +
a([2/2]) + a(1) = (a(2)+a(1)+a(1)) + (a(1)+a(1)) + a(1) + a(1) = a([2/2]) +
6*a(1) = a(1) + 6*1 = 7.
		

Crossrefs

Cf. A022825.