A089341 - OEIS

A089341

Numbers n with spf(n) < gpf(n) < 2*spf(n), where spf=A020639, gpf=A006530.

6, 12, 15, 18, 24, 35, 36, 45, 48, 54, 72, 75, 77, 91, 96, 108, 135, 143, 144, 162, 175, 187, 192, 209, 216, 221, 225, 245, 247, 288, 299, 323, 324, 375, 384, 391, 405, 432, 437, 486, 493, 527, 539, 551, 576, 589, 637, 648, 667, 675, 703, 713, 768, 847, 851

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

A046665(a(n)) < A020639(a(n));

A081306 without prime powers.

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

Eric Weisstein's World of Mathematics, Smooth Number

PROG

(Haskell)

a089341 n = a089341_list !! (n-1)