A190892 Numbers that can be written as a*b = c*d*e, where a, b, c, d, and e are distinct composite numbers.

192, 216, 240, 288, 320, 336, 360, 384, 432, 448, 480, 504, 528, 540, 560, 576, 600, 624, 640, 648, 672, 704, 720, 756, 768, 792, 800, 810, 816, 832, 840, 864, 880, 896, 900, 912, 936, 960, 972, 1000, 1008, 1024, 1040, 1056, 1080, 1088, 1104, 1120, 1134

Offset: 1

Author

T. D. Noe, May 23 2011

Keywords

• nonn

Comments

Similar to A175340, but without the requirement that the composite numbers be consecutive. In this case, the k in A175340 can be taken to be 2.

Almost all numbers are in this sequence. Its complement has density O(n (log log n)^4/log n). - Charles R Greathouse IV, May 23 2011

Examples

			192 = 12*16 = 4*6*8.
		

Links

• T. D. Noe, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A162247 (all factorizations of numbers), A175340.

A339245 is a subsequence.