A212666 - OEIS

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A212666

Numbers such that the greatest prime divisor is less than the product of the other distinct prime divisors.

30, 60, 70, 90, 105, 120, 140, 150, 154, 165, 180, 182, 195, 210, 231, 240, 270, 273, 280, 286, 300, 308, 315, 330, 350, 357, 360, 364, 374, 385, 390, 399, 418, 420, 429, 442, 450, 455, 462, 480, 490, 494, 495, 510, 525, 540, 546, 560, 561, 570, 572, 585, 595

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

OFFSET

1,1

LINKS

R. J. Mathar, Table of n, a(n) for n = 1..10000

EXAMPLE

30 is in the sequence because 30 = 2*3*5 and 5 < 2 * 3 = 6.

MAPLE

with(numtheory):for n from 2 to 600 do:x:=factorset(n):m:=nops(x): p:=product( '

x[i] ', 'i'=1..m): q:=p/x[m]:if x[m] < q then printf(`%d, `, n):else fi:od:

CROSSREFS

Sequence in context: A267967 A051283 A066031 * A291046 A071140 A221054

Adjacent sequences: A212663 A212664 A212665 * A212667 A212668 A212669

KEYWORD

nonn

AUTHOR

Michel Lagneau, May 23 2012

STATUS

approved