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A000068 Numbers n such that n^4 + 1 is prime.
(Formerly M1027 N0386)
+0
30
1, 2, 4, 6, 16, 20, 24, 28, 34, 46, 48, 54, 56, 74, 80, 82, 88, 90, 106, 118, 132, 140, 142, 154, 160, 164, 174, 180, 194, 198, 204, 210, 220, 228, 238, 242, 248, 254, 266, 272, 276, 278, 288, 296, 312, 320, 328, 334, 340, 352, 364, 374, 414, 430, 436, 442, 466 (list; graph; listen)
OFFSET

1,2

REFERENCES

M. Lal, Primes of the form n^4 + 1, Math. Comp., 21 (1967), 245-247.

LINKS

T. D. Noe, Table of n, a(n) for n=1..10000

MATHEMATICA

Select[Range[10^2*2], PrimeQ[ #^4+1] &] (from Vladimir Orlovsky (4vladimir(AT)gmail.com), May 01 2008)

PROGRAM

(PARI) a(n)=local(m); if(n<1, 0, for(k=1, n, until(isprime(m^4+1), m++)); m)

CROSSREFS

Cf. A037896.

Cf. A005574, A006314, A006313, A006315, A006316, A056994, A056995

Sequence in context: A114874 A100361 A069654 this_sequence A067662 A001774 A053285

Adjacent sequences: A000065 A000066 A000067 this_sequence A000069 A000070 A000071

KEYWORD

nonn,easy

AUTHOR

njas

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.


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