OFFSET
1,1
EXAMPLE
a(1)=105120136153171190210231 because 105120136153171190210231 is the prime formed by concatenation of 8 consecutive triangular numbers i.e. 105,120,136,153,171,190,210 and 231.
MATHEMATICA
Select[FromDigits[Flatten[IntegerDigits/@#]]& /@Partition[Accumulate[Range[2000]], 8, 1], PrimeQ] (* Harvey P. Dale, Mar 20 2011 *)
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Shyam Sunder Gupta, Apr 25 2005
STATUS
approved