A081556 Next-to-last term in n-th row of A080504.

1, 2, 5, 4, 8, 6, 11, 8, 14, 10, 17, 12, 20, 14, 23, 16, 26, 18, 29, 20, 32, 22, 32, 24, 38, 26, 41, 28, 44, 30, 47, 32, 50, 34, 53, 36, 56, 38, 59, 40, 62, 42, 65, 44, 68, 46, 71, 48, 74, 50, 77, 52, 80, 54, 83, 56, 86, 58, 89, 60, 92, 62, 95, 64, 98, 66, 101, 68, 104, 70

Offset: 2

Author

Dean Hickerson, Mar 21 2003

Keywords

• nonn

Comments

If n is odd, a(n) = n-1. If n is even, n-1 <= a(n) <= 3n/2-1. For even n up to 100, a(n) = 3n/2-1 unless n = 2 or 24; are there other exceptions? - Dean Hickerson, Mar 21 2003

Examples

			a(24)=32 since the 24th row of A080504 can be exhibited as: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 32, y with y = 3^15*5^20*7^21*11^22*13^23*17^23*19^23.
		

Crossrefs

Cf. A080504, A080505, A080506, A080507.