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A131991
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a(n) = 1 + prime(n) + prime(n)^2 + prime(n)^3.
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9
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15, 40, 156, 400, 1464, 2380, 5220, 7240, 12720, 25260, 30784, 52060, 70644, 81400, 106080, 151740, 208920, 230764, 305320, 363024, 394420, 499360, 578760, 712980, 922180, 1040604, 1103440, 1236600, 1307020, 1455780, 2064640, 2265384
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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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FORMULA
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EXAMPLE
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a(4)=400 because the 4th prime is 7, 7^3=343, 7^2=49, and 343+49+7+1=400.
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MAPLE
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A131991:= n -> map (p -> p^(3)+p^(2)+p+1, ithprime(n)):
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MATHEMATICA
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PROG
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(Magma) [1+NthPrime(n)+NthPrime(n)^2+NthPrime(n)^3: n in [1..40]]; // Vincenzo Librandi, Dec 27 2010
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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