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A178723
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Pseudoprimes to base 2 of the form 4k+1.
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1
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341, 561, 645, 1105, 1729, 1905, 2465, 2701, 2821, 3277, 4033, 4369, 4681, 5461, 6601, 7957, 8321, 8481, 10261, 10585, 11305, 12801, 13741, 13981, 15709, 15841, 16705, 18705, 18721, 23001, 23377, 25761, 29341, 30121, 30889, 31417, 31609, 31621, 33153, 34945, 35333, 39865, 41041, 41665, 46657, 49141, 49981, 52633
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OFFSET
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1,1
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LINKS
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Table of n, a(n) for n=1..48.
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PROG
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(PARI) forstep(n=5, 10^7, 4, if(isprime(n), next()); if(Mod(2, n)^(n-1)==1, print1(n, ", ")))
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CROSSREFS
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Cf. A001567, A177884.
Sequence in context: A025353 A025345 A001567 * A210993 A006970 A007324
Adjacent sequences: A178720 A178721 A178722 * A178724 A178725 A178726
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KEYWORD
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nonn
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AUTHOR
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Joerg Arndt, Dec 30 2010
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STATUS
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approved
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