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A248874
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Primitive prime factors of the cyclotomic polynomial sequence Phi(10,k) in the order in which they occur.
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6
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11, 61, 5, 41, 521, 101, 191, 331, 1181, 9091, 13421, 19141, 2411, 71, 31, 1531, 61681, 9041, 2251, 152381, 185641, 224071, 211, 5791, 9161, 431, 1021, 271, 53951, 401, 71261, 21821, 251, 4051, 1151041, 259631, 132631, 241, 6781, 1824841, 2031671, 41011
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OFFSET
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1,1
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COMMENTS
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Phi(10,k) = k^4 - k^3 + k^2 - k + 1.
Note that except for a(3), all terms end with the digit 1.
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LINKS
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MATHEMATICA
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prim = {}; Do[prim = Join[prim, Complement[First /@ FactorInteger[Cyclotomic[10, k]], prim]], {k, 1000}]; prim
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CROSSREFS
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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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