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A076567
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Greatest prime divisor of 4n+6 (sum of four successive integers).
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2
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5, 7, 3, 11, 13, 5, 17, 19, 7, 23, 5, 3, 29, 31, 11, 7, 37, 13, 41, 43, 5, 47, 7, 17, 53, 11, 19, 59, 61, 7, 13, 67, 23, 71, 73, 5, 11, 79, 3, 83, 17, 29, 89, 13, 31, 19, 97, 11, 101, 103, 7, 107, 109, 37, 113, 23, 13, 17, 11, 41, 5, 127, 43, 131, 19, 5, 137, 139, 47, 13
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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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MAPLE
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f:= n -> max(numtheory:-factorset(n)):
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MATHEMATICA
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FactorInteger[#][[-1, 1]]&/@(4*Range[70]+6) (* Harvey P. Dale, Mar 12 2017 *)
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PROG
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(PARI) a(n) = {f = factor(4*n+6); return (f[length(f~), 1]); } \\ Michel Marcus, Apr 19 2013
(PARI) a(n) = vecmax(factor(4*n+6)[, 1]); \\ Michel Marcus, Nov 10 2020
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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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