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A138326
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Numbers not representable as p+g, where p is a prime and g is a primitive root of p.
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3
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1, 2, 4, 6, 9, 11, 14, 16, 25, 26, 35, 36, 41, 45, 49, 51, 64, 81, 100, 121, 144, 169, 196, 225, 256, 289, 324, 361, 400, 441, 484, 529, 576, 625, 676, 729, 784, 841, 900, 961, 1024, 1089, 1156, 1225, 1296, 1369, 1444, 1521, 1600, 1681, 1764, 1849, 1936, 2025
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OFFSET
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1,2
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COMMENTS
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This sequence appears to contain all the positive squares (A000290) and a few other numbers (A138327).
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LINKS
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MATHEMATICA
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seq[m_] := Module[{p = Select[Range[m], PrimeQ]}, Complement[Range[m], p + PrimitiveRootList[p] // Flatten]]; seq[2000] (* Amiram Eldar, Oct 09 2021 *)
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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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