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A091300
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Nonprimes of the form 6k + 1.
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10
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1, 25, 49, 55, 85, 91, 115, 121, 133, 145, 169, 175, 187, 205, 217, 235, 247, 253, 259, 265, 289, 295, 301, 319, 325, 343, 355, 361, 385, 391, 403, 415, 427, 445, 451, 469, 475, 481, 493, 505, 511, 517, 529, 535, 553, 559, 565, 583, 589, 595, 625, 637, 649
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OFFSET
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1,2
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LINKS
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MAPLE
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for k from 0 to 100 do if(not isprime(6*k+1))then printf("%d, ", 6*k+1); fi: od: # Nathaniel Johnston, May 18 2011
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MATHEMATICA
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Do[If[ !PrimeQ[n]&&Equal[Mod[n, 6], 1 ], Print[n]], {n, 1, 1000}]
DeleteCases[6*Range[0, 150]+1, _?PrimeQ] (* Harvey P. Dale, Jun 23 2014 *)
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PROG
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(GAP) Filtered(List([0..110], k->6*k+1), n->not IsPrime(n)); # Muniru A Asiru, Mar 12 2019
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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