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URL: https://oeis.org/A124200

⇱ A124200 - OEIS

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A124200
Numbers k such that 1 + k + k^3 + k^5 + k^7 + k^9 + k^11 + k^13 + k^15 + k^17 + k^19 + k^21 + k^23 + k^25 + k^27 + k^29 + k^31 + k^33 + k^35 + k^37 + k^39 + k^41 + k^43 is prime.
5
1, 7, 10, 171, 304, 322, 357, 385, 418, 436, 448, 592, 606, 628, 642, 858, 1065, 1186, 1438, 1543, 1639, 1843, 1848, 1879, 1899, 2110, 2241, 2517, 2544, 2578, 2668, 3195, 3207, 3306, 3307, 3657, 4137, 4177, 4329, 4617, 4837, 4945, 4956, 5026, 5281, 5509
OFFSET
1,2
LINKS
MATHEMATICA
Do[If[PrimeQ[1 + n + n^3 + n^5 + n^7 + n^9 + n^11 + n^13 + n^15 + n^17 + n^19 + n^21 + n^23 + n^25 + n^27 + n^29 + n^31 + n^33 + n^35 + n^37 + n^39 + n^41 + n^43], Print[n]], {n, 1, 2400}]
Select[Range[6000], PrimeQ[Total[#^Range[1, 43, 2]] + 1] &] (* Vincenzo Librandi, Jun 28 2014 *)
PROG
(Magma) [n: n in [0..5000] | IsPrime(s) where s is 1+&+[n^i: i in [1..43 by 2]]]; // Vincenzo Librandi, Jun 28 2014
(PARI) is(n)=isprime(1+n+n^3+n^5+n^7+n^9+n^11+n^13+n^15+n^17+n^19+n^21+n^23 + n^25+n^27+n^29+n^31+n^33+n^35+n^37+n^39+n^41+n^43) \\ Charles R Greathouse IV, Feb 20 2017
CROSSREFS
Cf. A049407, similar sequences listed in A244376.
Sequence in context: A351685 A123797 A123805 * A384855 A282038 A133346
KEYWORD
nonn,easy
AUTHOR
Artur Jasinski, Dec 13 2006
STATUS
approved