%I #5 Nov 21 2013 12:48:40
%S 210231253,496528561,630666703,780820861,99010351081,495050505151,
%T 918093169453,9730987010011,120901224612403,135301369513861,
%U 201002030120503,223662257822791,368563712837401,379503822638503
%N Primes formed by concatenation of 3 consecutive triangular numbers.
%H Harvey P. Dale, <a href="/A105294/b105294.txt">Table of n, a(n) for n = 1..1000</a>
%e a(1)=210231253 because 210231253 is the prime formed by concatenation of 3 consecutive triangular numbers i.e. 210,231 and 253.
%t Select[FromDigits[Flatten[IntegerDigits[#]]]&/@Partition[Accumulate[ Range[300]], 3,1],PrimeQ] (* _Harvey P. Dale_, Sep 29 2011 *)
%K base,nonn
%O 1,1
%A _Shyam Sunder Gupta_, Apr 25 2005
|