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A085416
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Take prime[n] and continue adding 1,2,..., A085415(n) until one reaches a prime a(n).
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4
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3, 13, 11, 13, 17, 19, 23, 29, 29, 107, 37, 43, 47, 53, 53, 59, 137, 67, 73, 107, 79, 89, 89, 167, 103, 107, 109, 113, 137, 149, 137, 137, 173, 149, 227, 157, 163, 173, 173, 179, 257, 191, 197, 199, 233, 227, 239, 229, 233, 239, 239, 317, 251, 257, 263, 269, 347
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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a(2)=13 because prime[2]=3 and 3+(1+2+3+4)=3+10=13 is a prime.
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MATHEMATICA
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Table[SelectFirst[Prime[n]+Accumulate[Range[20]], PrimeQ], {n, 60}] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Aug 11 2019 *)
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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