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Sequence formed by writing out the primes, one digit at a time, prefixing each prime by the number of digits it contains (the latter number being written as a normal decimal number, not digit-by-digit).
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%I #5 Nov 21 2013 12:48:37

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

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

%U 2,9,7,3,1,0,1,3,1,0,3,3,1,0,7,3,1,0,9,3,1,1,3,3,1,2,7,3,1,3,1,3,1,3,7,3

%N Sequence formed by writing out the primes, one digit at a time, prefixing each prime by the number of digits it contains (the latter number being written as a normal decimal number, not digit-by-digit).

%C List of pairs: (number of digits of prime(n), digits of prime(n)).

%C As a decimal number this is 0.12131517211213217219223....

%t Flatten[{IntegerLength[#],IntegerDigits[#]}&/@Prime[Range[50]]] (* _Harvey P. Dale_, Jul 12 2011 *)

%K nonn,base

%O 1,2

%A Ryan B. Florence (rflorence2004(AT)yahoo.com), Feb 01 2005