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Primes that are concatenations of nonprime numbers.
1

%I #3 Feb 11 2014 19:05:24

%S 11,19,41,61,89,101,109,127,139,149,151,157,163,181,191,193,199,211,

%T 229,241,251,269,271,281,331,349,359,389,401,409,419,421,433,439,449,

%U 457,461,463,487,491,499,509,521,541,569,571,601,619,631,641,659,661

%N Primes that are concatenations of nonprime numbers.

%e The prime 163 is the concatenation of nonprime numbers 1 and 63. 419 is the concatenation of 4, 1 and 9.

%K base,easy,nonn

%O 1,1

%A _Joseph L. Pe_, Jan 16 2002

%E More terms from Larry Reeves (larryr(AT)acm.org), Apr 03 2002