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A105294
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Primes formed by concatenation of 3 consecutive triangular numbers.
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1
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210231253, 496528561, 630666703, 780820861, 99010351081, 495050505151, 918093169453, 9730987010011, 120901224612403, 135301369513861, 201002030120503, 223662257822791, 368563712837401, 379503822638503
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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)=210231253 because 210231253 is the prime formed by concatenation of 3 consecutive triangular numbers i.e. 210,231 and 253.
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MATHEMATICA
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Select[FromDigits[Flatten[IntegerDigits[#]]]&/@Partition[Accumulate[ Range[300]], 3, 1], PrimeQ] (* Harvey P. Dale, Sep 29 2011 *)
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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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