Search: id:A000068
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%I A000068 M1027 N0386
%S A000068 1,2,4,6,16,20,24,28,34,46,48,54,56,74,80,82,88,90,106,118,132,140,142,
%T A000068 154,160,164,174,180,194,198,204,210,220,228,238,242,248,254,266,272,
%U A000068 276,278,288,296,312,320,328,334,340,352,364,374,414,430,436,442,466
%N A000068 Numbers n such that n^4 + 1 is prime.
%D A000068 M. Lal, Primes of the form n^4 + 1, Math. Comp., 21 (1967), 245-247.
%D A000068 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A000068 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%H A000068 T. D. Noe, <a href="b000068.txt">Table of n, a(n) for n=1..10000</a>
%t A000068 Select[Range[10^2*2], PrimeQ[ #^4+1] &] (from Vladimir Orlovsky (4vladimir(AT)gmail.com), 
               May 01 2008)
%o A000068 (PARI) a(n)=local(m); if(n<1,0, for(k=1,n,until(isprime(m^4+1),m++)); 
               m)
%Y A000068 Cf. A037896.
%Y A000068 Cf. A005574, A006314, A006313, A006315, A006316, A056994, A056995
%Y A000068 Sequence in context: A114874 A100361 A069654 this_sequence A067662 A001774 
               A053285
%Y A000068 Adjacent sequences: A000065 A000066 A000067 this_sequence A000069 A000070 
               A000071
%K A000068 nonn,easy
%O A000068 1,2
%A A000068 N. J. A. Sloane (njas(AT)research.att.com).

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