A107434 Smallest available integer allowing a digit of a(n) and a digit of a(n+1) to add up to 9.

0, 9, 10, 8, 1, 18, 11, 28, 7, 2, 17, 12, 27, 20, 19, 30, 6, 3, 16, 13, 26, 23, 36, 31, 38, 14, 5, 4, 15, 24, 25, 34, 35, 40, 29, 37, 21, 47, 22, 57, 32, 46, 33, 56, 39, 50, 41, 45, 42, 51, 43, 52, 44, 53, 48, 54, 49, 55, 64, 58, 61, 63, 60, 59, 70, 62, 67, 72, 71, 68, 73, 65, 74

Offset

0,2

Comments

Starting with another "seed" than 0 would produce another sequence.

Links

Table of n, a(n) for n=0..72.

Example

After 19 we must have an integer containing an "8" (1+"8"=9) or a "0" (9+"0"=9). The smallest available such integer is 30 (0 is not available, nor 8, 10, 18, 20 and 28 -- all of those containing either a "0" or an "8")

Crossrefs

Sequence in context: A333774 A205151 A167691 * A334681 A020508 A158001

Adjacent sequences: A107431 A107432 A107433 * A107435 A107436 A107437

Keyword

base,easy,nonn

Author

Eric Angelini, Jun 09 2005

Extensions

Corrected and extended by Zak Seidov, Jun 10 2005

Status

approved