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Search: id:A081053
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| A081053 |
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Sum of a prime and the square of a prime. |
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+0
3
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| 6, 7, 9, 11, 12, 14, 15, 16, 17, 20, 21, 22, 23, 26, 27, 28, 30, 32, 33, 35, 36, 38, 40, 41, 42, 44, 45, 46, 47, 48, 50, 51, 52, 54, 56, 57, 60, 62, 63, 65, 66, 68, 70, 71, 72, 75, 76, 77, 78, 80, 82, 83, 84, 86, 87, 88, 90, 92, 93, 96, 98, 101, 102, 104, 105, 106, 107, 108
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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Suggested by a Goldbach-type conjecture.
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FORMULA
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a(n) = p^2 + q, p and q primes.
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EXAMPLE
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7=2^2+3
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MAPLE
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G := proc(n::posint) local p, q; p := 2; while p<=n-2 do q := n-p^2; if type(q, posint) then if isprime(q) then return(true, p, q); end if; end if; p := nextprime(p); end do; return(false); end:
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MATHEMATICA
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Take[ Union[ Flatten[ Table[ Prime[i] + Prime[j]^2, {i, 1, 30}, {j, 1, 5}]]], 70]
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CROSSREFS
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Sequence in context: A102740 A120183 A032710 this_sequence A022892 A120164 A074898
Adjacent sequences: A081050 A081051 A081052 this_sequence A081054 A081055 A081056
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KEYWORD
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nonn
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AUTHOR
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Pilar Guerra Cardenas (pilarguerracardenas(AT)hotmail.com), Mar 03 2003
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EXTENSIONS
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More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Mar 05 2003
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