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A305214
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Numbers k such that A305212(k) is not zero.
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0
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7, 9, 14, 18, 21, 27, 28, 35, 36, 42, 45, 49, 54, 56, 63, 70, 72, 77, 81, 84, 90, 91, 98, 99, 105, 108, 112, 117, 119, 126, 133, 135, 140, 144, 147, 153, 154, 161, 162, 168, 171, 175, 180, 182, 189, 196, 198, 203, 207, 210, 216, 217, 224, 225, 231, 234, 238
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OFFSET
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1,1
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COMMENTS
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Conjecture: These are simply the positive integers that are divisible by 7 or 9.
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LINKS
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PROG
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(Python) [n for n in range(100) if n != len(set((pow(x, 3, n) + pow(y, 3, n))%n for x in range(n) for y in range(n)))]
(PARI) isok(n) = my(v=[]); for (x=1, n, for (y=1, n, v = concat(v, Mod(x, n)^3 + Mod(y, n)^3))); n != #Set(v); \\ Michel Marcus, Jul 10 2018
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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