A076022 Position of 2n in A073662.

1, 4, 2, 9, 3, 8, 10, 7, 5, 11, 6, 15, 12, 14, 20, 16, 19, 13, 17, 21, 18, 26, 23, 25, 31, 22, 27, 32, 40, 30, 35, 28, 24, 34, 29, 39, 37, 41, 44, 33, 45, 36, 50, 42, 38, 65, 43, 46, 51, 47, 57, 52, 48, 54, 63, 55, 62, 58, 56, 49, 53, 60, 66, 64, 67, 59, 74, 68, 73, 71, 61, 70

Offset: 1

Author

Zak Seidov, Sep 30 2002

Keywords

• easy
• nonn

Comments

It is not clear that each even number will appear in A073662, though I've checked it up to 20000.

Examples

			a(1)=4 because 2*1=2 appears at 4th position in A073662, a(14)=14 because 2*14=28 appears at 14th position in A073662,
		

Crossrefs

Cf. A073662, A073664, A076023.

Formula

a(n) = position of (2n) in A073662: A073662(a(n)) = 2n.