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

1,1

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

Links

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

Example

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

Crossrefs

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

A339245 is a subsequence.

Sequence in context: A206336 A206335 A289219 * A039667 A273890 A344860

Adjacent sequences: A190889 A190890 A190891 * A190893 A190894 A190895

Keyword

nonn

Author

T. D. Noe, May 23 2011

Status

approved