A115021 - OEIS

%I #1 Feb 24 2006 03:00:00

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

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

%e Other versions:

%e 1 2 3 6 5 4 7 8 9

%e 3 6 9 8 5 2 1 4 7

%e 3 2 1 4 5 6 9 8 7

%e 7 8 9 6 5 4 1 2 3

%e 7 4 1 2 5 8 9 6 3

%e 9 6 3 2 5 8 7 4 1

%e 9 8 7 4 5 6 3 2 1

%K nonn,fini,full

%O 0,2

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