|
| |
|
|
A141698
|
|
Arrange the distinct prime divisors of each non-prime-power positive integer n in order from smallest to largest. n is included in sequence A141698 if the differences between consecutive primes in the arrangement of primes are all powers of 2 (including possibly 1).
|
|
1
| |
|
|
6, 12, 15, 18, 21, 24, 30, 33, 35, 36, 42, 45, 48, 54, 57, 60, 63, 65, 66, 72, 75, 77, 84, 90, 96, 99, 105, 108, 114, 120, 126, 132, 135, 143, 144, 147, 150, 161, 162, 168, 171, 175, 180, 185, 189, 192, 195, 198, 201, 209, 210, 216, 221, 225, 228, 231, 240, 245, 252
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
EXAMPLE
| 84 has the prime factorization 2^2 *3^1 *7^1. So the distinct primes dividing 84 are 2,3 and 7. 3-2=1, a power of 2. And 7-3 = 4, also a power of 2. So 84 is included in this sequence.
|
|
|
CROSSREFS
| Cf. A024619, A000079.
Sequence in context: A129512 A196391 A116359 * A091011 A104210 A066312
Adjacent sequences: A141695 A141696 A141697 * A141699 A141700 A141701
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Leroy Quet Jun 30 2008
|
|
|
EXTENSIONS
| Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Jun 22 2009
|
| |
|
|
