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%I #7 Aug 27 2019 14:44:43
%S 136101521,153171190210231253,231253276300325351,86190394699010351081,
%T 185281872118915191101930619503,193061950319701199002010020301,
%U 225782279123005232202343623653,385033878139060393403962139903
%N Primes formed by concatenation of 6 consecutive triangular numbers.
%H Harvey P. Dale, <a href="/A105297/b105297.txt">Table of n, a(n) for n = 1..1000</a>
%e a(1)=136101521 because 136101521 is the prime formed by concatenation of 6 consecutive triangular numbers i.e. 1,3,6,10,15 and 21.
%t Select[FromDigits[Flatten[IntegerDigits/@#]]&/@Partition[Accumulate[ Range[ 500]],6,1],PrimeQ] (* _Harvey P. Dale_, Aug 27 2019 *)
%K base,nonn
%O 1,1
%A _Shyam Sunder Gupta_, Apr 25 2005
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