|
| |
|
|
A052294
|
|
Pernicious numbers: numbers with a prime number of 1's in their binary expansion.
|
|
7
| |
|
|
3, 5, 6, 7, 9, 10, 11, 12, 13, 14, 17, 18, 19, 20, 21, 22, 24, 25, 26, 28, 31, 33, 34, 35, 36, 37, 38, 40, 41, 42, 44, 47, 48, 49, 50, 52, 55, 56, 59, 61, 62, 65, 66, 67, 68, 69, 70, 72, 73, 74, 76, 79, 80, 81, 82, 84, 87, 88, 91, 93, 94, 96, 97, 98, 100
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
COMMENTS
| If a prime p is of the form 2^k -1, then p is included in this sequence. [From Leroy Quet Sep 20 2008]
|
|
|
LINKS
| T. D. Noe, Table of n, a(n) for n=1..1000
|
|
|
EXAMPLE
| No power of two is pernicious, but 2^n+1 always is.
|
|
|
MATHEMATICA
| Select[Range[6! ], PrimeQ[DigitCount[ #, 2][[1]]]&] [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Feb 16 2010]
|
|
|
CROSSREFS
| Cf. A000069, A001969.
Sequence in context: A184987 A188916 A080943 * A191916 A182834 A116883
Adjacent sequences: A052291 A052292 A052293 * A052295 A052296 A052297
|
|
|
KEYWORD
| easy,nice,nonn
|
|
|
AUTHOR
| Jeremy Gow (jeremygo(AT)dai.ed.ac.uk), Feb 08 2000
|
| |
|
|
