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A105295
Primes formed by concatenation of 4 consecutive triangular numbers.
1
171190210231, 465496528561, 94699010351081, 1275132613781431, 7626775078758001, 11325114761162811781, 12561127201288013041, 14535147061487815051, 18145183361852818721, 19701199002010020301
OFFSET
1,1
LINKS
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
Sequence in context: A241501 A197633 A339122 * A288262 A233624 A104800
KEYWORD
base,nonn
AUTHOR
Shyam Sunder Gupta, Apr 25 2005
STATUS
approved