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%I #4 Dec 12 2013 11:56:30
%S 19531891183017701711,30032926285027752701,4075540470401863990339621,
%T 6570365341649806462064261,7277172390720107163171253,
%U 8715386736863208590585491,190653190036189420188805188191
%N Primes formed by reverse concatenation of 5 consecutive triangular numbers.
%e a(1)=19531891183017701711 because 19531891183017701711 is the prime formed by reverse concatenation of 5 consecutive triangular numbers i.e. 1711,1770,1830,1891 and 1953.
%t Module[{rtrs=Partition[Reverse[Accumulate[Range[1000]]],5,1]},Sort[ Select[ FromDigits/@ (Flatten/@(IntegerDigits/@rtrs)),PrimeQ]]] (* _Harvey P. Dale_, Dec 12 2013 *)
%K base,nonn
%O 1,1
%A _Shyam Sunder Gupta_, Apr 25 2005