A085758 Least m such that phi(x)=2m has exactly n solutions.

5, 1, 2, 4, 6, 16, 18, 20, 12, 24, 80, 198, 1134, 352, 156, 36, 168, 108, 468, 72, 312, 528, 880, 180, 1280, 192, 144, 660, 1848, 120, 384, 4500, 216, 3564, 2100, 240, 288, 648, 600, 7968, 1656, 1536, 1620, 432, 1560, 3672, 1944, 360, 840, 2496, 8820, 1008, 576

Offset: 2

Author

Lekraj Beedassy, Jul 22 2003

Keywords

• nonn

Comments

Sequence refers to the rank of the first occurrence of n in A032446.

Examples

			a(0) = 7. Carmichael conjectured that a(1) doesn't exist.
		

Crossrefs

Cf. A032446.

Formula

a(n) = A007374(n)/2 for n > 2. - David Wasserman, Feb 09 2005

Extensions

More terms from David Wasserman, Feb 09 2005