A115021 Numbers typed on a keyboard's numeric keypad: start at 1 and read alternately up and down until reaching 9.

1, 4, 7, 8, 5, 2, 3, 6, 9

Offset

0,2

Links

Table of n, a(n) for n=0..8.

Example

Other versions:
1 2 3 6 5 4 7 8 9
3 6 9 8 5 2 1 4 7
3 2 1 4 5 6 9 8 7
7 8 9 6 5 4 1 2 3
7 4 1 2 5 8 9 6 3
9 6 3 2 5 8 7 4 1
9 8 7 4 5 6 3 2 1

Crossrefs

Sequence in context: A176778 A021213 A154687 * A200367 A272490 A261654

Adjacent sequences: A115018 A115019 A115020 * A115022 A115023 A115024

Keyword

nonn,fini,full

Author

Gilson Soares (gilson.soares(AT)gmail.com), Feb 23 2006

Status

approved