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A023569
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Greatest prime divisor of prime(n) - 3.
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2
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2, 2, 2, 5, 7, 2, 5, 13, 7, 17, 19, 5, 11, 5, 7, 29, 2, 17, 7, 19, 5, 43, 47, 7, 5, 13, 53, 11, 31, 2, 67, 17, 73, 37, 11, 5, 41, 17, 11, 89, 47, 19, 97, 7, 13, 11, 7, 113, 23, 59, 17, 31, 127, 13, 19, 67, 137, 139, 7, 29, 19, 11, 31, 157, 41, 167, 43, 173, 7, 89
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OFFSET
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3,1
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COMMENTS
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a(n) = 2 if prime(n) is in A057733. - Robert Israel, Dec 28 2015
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LINKS
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Robert Israel, Table of n, a(n) for n = 3..10000
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MAPLE
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seq(max(numtheory:-factorset(ithprime(i)-3)), i=3..100); # Robert Israel, Dec 28 2015
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MATHEMATICA
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Table[FactorInteger[Prime[n] - 3] [[-1, 1]], {n, 3, 100}] (* Vincenzo Librandi, Dec 29 2015 *)
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PROG
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(PARI) a(n) = vecmax(factor(prime(n)-3)[, 1]); \\ Michel Marcus, Dec 29 2015
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CROSSREFS
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Cf. A023568, A057733.
Sequence in context: A136347 A279515 A260338 * A263373 A145876 A240540
Adjacent sequences: A023566 A023567 A023568 * A023570 A023571 A023572
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KEYWORD
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nonn
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AUTHOR
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Clark Kimberling
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EXTENSIONS
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Corrected by Robert Israel, Dec 29 2015
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STATUS
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approved
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