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A105297
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Primes formed by concatenation of 6 consecutive triangular numbers.
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1
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136101521, 153171190210231253, 231253276300325351, 86190394699010351081, 185281872118915191101930619503, 193061950319701199002010020301, 225782279123005232202343623653, 385033878139060393403962139903
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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)=136101521 because 136101521 is the prime formed by concatenation of 6 consecutive triangular numbers i.e. 1,3,6,10,15 and 21.
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MATHEMATICA
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Select[FromDigits[Flatten[IntegerDigits/@#]]&/@Partition[Accumulate[ Range[ 500]], 6, 1], PrimeQ] (* Harvey P. Dale, Aug 27 2019 *)
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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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