OFFSET
1,1
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
EXAMPLE
a(1)=171190210231 because 171190210231 is the prime formed by concatenation of 4 consecutive triangular numbers i.e. 171,190,210 and 231.
MATHEMATICA
Select[FromDigits[Flatten[IntegerDigits/@#]]&/@Partition[Accumulate[ Range[ 300]], 4, 1], PrimeQ] (* Harvey P. Dale, Sep 25 2014 *)
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Shyam Sunder Gupta, Apr 25 2005
STATUS
approved