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A168550
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Natural numbers k for which 1 + 2*k^3 is prime.
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8
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1, 2, 5, 6, 9, 11, 12, 20, 21, 26, 27, 29, 30, 32, 35, 44, 57, 59, 60, 71, 72, 77, 86, 92, 95, 96, 99, 107, 111, 120, 134, 140, 149, 150, 152, 159, 162, 164, 165, 170, 185, 186, 191, 192, 197, 204, 221, 227, 231, 237, 246, 249, 252, 260, 264, 266, 269, 275, 290, 297
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OFFSET
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1,2
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LINKS
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EXAMPLE
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20 is a term because 1 + 2*20^3 = 16001 is prime.
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MAPLE
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isA168550 := proc(n) isprime(1+2*n^3) ; end proc: for n from 1 to 400 do if isA168550(n) then printf("%d, ", n) ; end if; end do: # R. J. Mathar, Nov 30 2009
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MATHEMATICA
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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