|
Search: id:A075568
|
|
|
| A075568 |
|
Rearrangement of noncomposite numbers such that every partial sum is composite. |
|
+0
2
|
|
| 1, 3, 2, 19, 5, 47, 7, 11, 13, 17, 23, 29, 31, 37, 41, 43, 53, 59, 61, 71, 67, 73, 79, 83, 89, 101, 97, 103, 107, 113, 109, 131, 127, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 229, 227, 239, 233, 241, 251, 257, 263, 271, 269
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
COMMENT
|
Conjectured to consist of consecutive primes after 53. (See also comments in A123055.)
|
|
PROGRAM
|
(PARI) v=vector(1000000):s=1:for(n=1, 100, f=0:forprime(p=2, 1000000, if(!v[p]&&!isprime(s+p), f=p:break)): if(f, print1(f", "):v[f]=1:s=s+f, print1("0, ")))
|
|
CROSSREFS
|
First differences of A123055 (except for the leading 1). - njas, Sep 26 2006
Sequence in context: A092644 A006281 A078073 this_sequence A057026 A032448 A066195
Adjacent sequences: A075565 A075566 A075567 this_sequence A075569 A075570 A075571
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Sep 25 2002
|
|
EXTENSIONS
|
More terms from Ralf Stephan (ralf(AT)ark.in-berlin.de), Mar 30 2003
|
|
|
Search completed in 0.002 seconds
|
