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A105295
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Primes formed by concatenation of 4 consecutive triangular numbers.
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1
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171190210231, 465496528561, 94699010351081, 1275132613781431, 7626775078758001, 11325114761162811781, 12561127201288013041, 14535147061487815051, 18145183361852818721, 19701199002010020301
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OFFSET
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1,1
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LINKS
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EXAMPLE
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a(1)=171190210231 because 171190210231 is the prime formed by concatenation of 4 consecutive triangular numbers i.e. 171,190,210 and 231.
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MATHEMATICA
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Select[FromDigits[Flatten[IntegerDigits/@#]]&/@Partition[Accumulate[ Range[ 300]], 4, 1], PrimeQ] (* Harvey P. Dale, Sep 25 2014 *)
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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STATUS
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approved
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