A105295 Primes formed by concatenation of 4 consecutive triangular numbers.

171190210231, 465496528561, 94699010351081, 1275132613781431, 7626775078758001, 11325114761162811781, 12561127201288013041, 14535147061487815051, 18145183361852818721, 19701199002010020301

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

Sequence in context: A241501 A197633 A339122 * A288262 A233624 A104800

Adjacent sequences: A105292 A105293 A105294 * A105296 A105297 A105298

Keyword

base,nonn

Author

Shyam Sunder Gupta, Apr 25 2005

Status

approved