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A121944
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Composite number of the form 4n^2+1.
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1
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65, 145, 325, 485, 785, 901, 1025, 1157, 1445, 1765, 1937, 2117, 2305, 2501, 2705, 3365, 3601, 3845, 4097, 4625, 4901, 5185, 5777, 6085, 6401, 6725, 7397, 7745, 8465, 9217, 9605, 10001, 10405, 10817, 11237, 11665, 12545, 12997, 13925, 14885, 16385
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OFFSET
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1,1
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LINKS
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FORMULA
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MATHEMATICA
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Select[Table[4n^2 + 1, {n, 70}], ! PrimeQ[ # ] &]
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CROSSREFS
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a(n) are elements of A053755 = 4*n^2 + 1, beside 1 that are not prime, that is they do not lie in A002496 = Primes of form n^2 + 1.
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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