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A270574
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Composites c where at least one composite d with d < c exists such that c^(d-1) == 1 (mod d) and d^(c-1) == 1 (mod c).
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4
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9, 15, 21, 25, 27, 28, 33, 35, 39, 45, 49, 51, 55, 57, 63, 65, 69, 75, 77, 81, 85, 87, 91, 93, 95, 99, 105, 111, 112, 115, 117, 119, 121, 123, 124, 125, 129, 133, 135, 141, 143, 145, 147, 148, 153, 155, 159, 161, 165, 169, 171, 175, 177, 183, 185, 187, 189
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OFFSET
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1,1
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COMMENTS
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LINKS
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PROG
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(PARI) forcomposite(c=1, 500, forcomposite(d=1, c-1, if(Mod(c, d)^(d-1)==1 && Mod(d, c)^(c-1)==1, print1(c, ", "); break({1}))))
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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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