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4033, 6601, 8321, 15841, 25761, 29341, 41041, 46657, 75361, 115921, 162401, 172081, 252601, 294409, 314821, 332949, 401401, 410041, 488881, 530881, 552721, 642001, 721801, 873181, 934021, 1004653, 1207361, 1461241, 1876393, 1909001, 2081713, 2085301, 2113921
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listen;
history;
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internal format)
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OFFSET
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1,1
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COMMENTS
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Only 1 (mod 4) numbers have been found.
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LINKS
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MATHEMATICA
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t[n_] := Which[Mod[n, 4] == 3, n + 1, Mod[n, 4] == 1, n - 1, True, n]; Select[1 + Range[99000], PowerMod[2, # - 1, #] == 1 && !PrimeQ[#] && Im[PowerMod[1 + 2I, t[#], #]] == 0 &]
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CROSSREFS
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Cf. A001567 (pseudoprimes to base 2).
Cf. A212502 (pseudoprimes to base 1+2i).
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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