OFFSET
1,1
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
EXAMPLE
a(1)=210231253 because 210231253 is the prime formed by concatenation of 3 consecutive triangular numbers i.e. 210,231 and 253.
MATHEMATICA
Select[FromDigits[Flatten[IntegerDigits[#]]]&/@Partition[Accumulate[ Range[300]], 3, 1], PrimeQ] (* Harvey P. Dale, Sep 29 2011 *)
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Shyam Sunder Gupta, Apr 25 2005
STATUS
approved