|
Search: id:A166063
|
|
|
| A166063 |
|
23-rough numbers: positive integers that have no prime factors less than 23 |
|
+0
7
|
|
| 1, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
COMMENT
|
Or, positive integers relatively prime to 9699690 = 2*3*5*7*11*13*17*19.
|
|
LINKS
|
Eric Weisstein's World of Mathematics, Rough Number From MathWorld--A Wolfram Web Resource.
Index entries for sequences related to smooth numbers [From Michael Porter (michael_b_porter(AT)yahoo.com), Oct 10 2009]
|
|
EXAMPLE
|
667 = 23 * 29 is in the sequence since the two prime factors, 23 and 29, are not less than 23.
|
|
PROGRAM
|
(PARI) isA166063(n) = gcd(n, 9699690)==1 [From Michael Porter (michael_b_porter(AT)yahoo.com), Oct 10 2009]
|
|
CROSSREFS
|
For k-rough numbers with other values of k, see A000027 A005408 A007310 A007775 A008364 A008365 A008366 A166061 A166063 [From Michael Porter (michael_b_porter(AT)yahoo.com), Oct 10 2009]
Sequence in context: A127495 A060703 A061753 this_sequence A049483 A112681 A078500
Adjacent sequences: A166060 A166061 A166062 this_sequence A166064 A166065 A166066
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
Michael Porter (michael_b_porter(AT)yahoo.com), Oct 05 2009
|
|
|
Search completed in 0.002 seconds
|
