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%I #7 Jan 28 2016 13:40:46
%S 2,22,222,3,33,333,4,44,444,5,55,555,6,66,666,7,77,777,7777,8,88,888,
%T 9,99,999,9999
%N The sequence of numbers which, when entered on a standard telephone numeric keypad, produce the letters a thru z. Letters are accessed by one or more presses of a single key.
%C Method of entry commonly used on cellular telephones for text-messaging. Not the sequence of a-z used in telephone numbers.
%e To generate the letter 'a', type '2', to generate 'b', type '2' twice, or '22'.
%K nonn,fini,full
%O 1,1
%A Adam Risi (ajrisi(AT)gmail.com), Mar 11 2010
%E Corrected by _Clive Tooth_, Jan 28 2016