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Search: id:A000068
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| A000068 |
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Numbers n such that n^4 + 1 is prime.
(Formerly M1027 N0386)
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+0
29
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| 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)
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OFFSET
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1,2
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REFERENCES
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M. Lal, Primes of the form n^4 + 1, Math. Comp., 21 (1967), 245-247.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..10000
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MATHEMATICA
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Select[Range[10^2*2], PrimeQ[ #^4+1] &] (from Vladimir Orlovsky (4vladimir(AT)gmail.com), May 01 2008)
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PROGRAM
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(PARI) a(n)=local(m); if(n<1, 0, for(k=1, n, until(isprime(m^4+1), m++)); m)
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CROSSREFS
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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
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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