A118065 a(1) = a(2) = 1, a(n) = smallest number greater than a(n-1) that can be written as sum of consecutive earlier terms.

1, 1, 2, 3, 4, 5, 6, 7, 9, 10, 11, 12, 13, 14, 15, 16, 18, 19, 20, 21, 22, 23, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 36, 37, 38, 39, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 73, 74, 75, 76, 77, 78

Offset: 1

Author

Reinhard Zumkeller, Apr 11 2006

Keywords

• nonn

Comments

Complement of A118066.

Examples

			a(20) = a(11) + a(10) = 11 + 10 = 21;
a(21) = a(9) + a(8) + a(7) = 9 + 7 + 6 = 22;
a(22) = a(12) + a(11) = 12 + 11 = 23;
a(23) = a(13) + a(12) = 13 + 12 = 25;
a(24) = a(10) + a(9) + a(8) = 10 + 9 + 7 = 26.
		

Links

• Eric Weisstein's World of Mathematics, Hofstadter Sequences

Crossrefs

Cf. A005243, A118066.