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A285811
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Primes equal to a centered heptagonal number plus 1.
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4
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2, 23, 107, 149, 317, 1619, 2459, 3257, 3929, 5189, 6029, 6323, 7247, 15017, 19427, 21023, 21569, 26189, 42737, 45887, 55127, 56009, 63317, 66173, 67139, 70079, 82469, 101747, 105359, 110273, 125687, 136523, 137909, 149249, 155087, 159539, 167099, 171719
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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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PROG
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(PARI) cpg(m, n) = m*n*(n-1)/2+1 \\ n-th centered m-gonal number
maxk=600; L=List(); for(k=1, maxk, if(isprime(p=cpg(7, k) + 1), listput(L, p))); Vec(L)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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