OFFSET
1,1
EXAMPLE
a(1)=10631 because 10631 is the prime formed by reverse concatenation of 4consecutive triangular numbers i.e. 1,3,6 and 10.
MATHEMATICA
Select[FromDigits[Flatten[IntegerDigits/@#]]&/@Reverse/@Partition[ Accumulate[ Range[400]], 4, 1], PrimeQ] (* Harvey P. Dale, Oct 12 2017 *)
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Shyam Sunder Gupta, Apr 25 2005
STATUS
approved