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

Offset: 1

Author

Reinhard Zumkeller, May 04 2003

Keywords

• nonn

Comments

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

Terms of A001358; A001248 is a subsequence.

Crossrefs

Cf. A083715, A083716, A083714 A083718.