%I #10 Mar 17 2015 02:15:40
%S 2,2,2,3,3,3,4,4,4,5,5,5,6,6,6,7,7,7,7,8,8,8,9,9,9,9
%N Digital equivalents of letters A, B, C, ..., Z on touch-tone telephone keypad.
%e a(3)= 2 because the third letter of the English alphabet, C, is represented by the digit 2 on telephone keypad.
%Y Cf. A079048.
%K fini,full,nonn
%O 1,1
%A _Donald S. McDonald_, Feb 01 2003