A083717 - OEIS

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A083717

(Greatest prime <= n) * (greatest prime factor of n).

1, 4, 9, 6, 25, 15, 49, 14, 21, 35, 121, 33, 169, 91, 65, 26, 289, 51, 361, 95, 133, 209, 529, 69, 115, 299, 69, 161, 841, 145, 961, 62, 341, 527, 217, 93, 1369, 703, 481, 185, 1681, 287, 1849, 473, 215, 989, 2209, 141, 329, 235, 799, 611, 2809, 159, 583, 371

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OFFSET

1,2

COMMENTS

a(n) = A007917(n)*A006530(n);

Terms of A001358; A001248 is a subsequence.

LINKS

Table of n, a(n) for n=1..56.

CROSSREFS

Cf. A083715, A083716, A083714 A083718.

Sequence in context: A287932 A074767 A016097 * A332451 A130041 A109987

Adjacent sequences: A083714 A083715 A083716 * A083718 A083719 A083720

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, May 04 2003

STATUS

approved