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A256312 Primes of the form n^2 + n + 712329866165608771. 1
712329866165608783, 712329866165608813, 712329866165609323, 712329866165609371, 712329866165610103, 712329866165611741, 712329866165612077, 712329866165612677, 712329866165612803, 712329866165614933, 712329866165621653, 712329866165624023 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
From Mollin's paper: "x^2 + x + A with A=712329866165608771 has the largest asymptotic density of primes for any polynomial of this type to date" (1997).
Is it still so?
LINKS
R. A. Mollin, Prime-producing quadratics, Amer. Math. Monthly 104 (1997), page 542.
MATHEMATICA
Select[Table[n^2 + n + 712329866165608771, {n, 1, 200}], PrimeQ]
PROG
(Magma) [a: n in [1..200] | IsPrime(a) where a is n^2 + n + 712329866165608771];
(PARI) for(n=1, 100, if(isprime(k=n^2+n+712329866165608771), print1(k, ", "))) \\ Derek Orr, Apr 05 2015
CROSSREFS
Cf. A256674 (associated n).
Sequence in context: A172565 A360140 A172546 * A173445 A281390 A281301
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Apr 05 2015
STATUS
approved

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Last modified May 21 22:16 EDT 2024. Contains 372741 sequences. (Running on oeis4.)