A098783 Smallest integer not occurring earlier such that the concatenation of the integers has the property that the first two digits sum to 9, the next two digits also, etc.

0, 9, 1, 8, 2, 7, 3, 6, 4, 5, 18, 27, 36, 45, 54, 63, 72, 81, 90, 180, 91, 80, 92, 70, 93, 60, 94, 50, 95, 40, 96, 30, 97, 20, 98, 10, 909, 181, 82, 71, 83, 61, 84, 51, 85, 41, 86, 31, 87, 21, 88, 11, 809, 182, 73, 62, 74, 52, 75, 42, 76, 32, 77, 22, 78, 12, 709, 183, 64, 53, 65

Offset: 0

Author

Eric Angelini, Oct 04 2004

Keywords

• base
• easy
• nonn

Comments

This sequence contains no beastly numbers (A051003). - Rémy Sigrist, Dec 31 2017

Examples

			When parenthesis are added one can see the successive pairs of digits with sum 9: (0, 9), (1, 8), (2, 7), (3, 6), (4, 5), (18), (27), (36), (45), (54), (63), (72), (81), (90), (18)(0, 9)(1, ... - _Eric Angelini_, Dec 18 2017
		

Links

• Rémy Sigrist, Table of n, a(n) for n = 0..10000
• Rémy Sigrist, PARI program for A098783

Crossrefs

Cf. A051003.