|
Search: id:A080675
|
|
| |
|
| 2, 12, 52, 212, 852, 3412, 13652, 54612, 218452, 873812, 3495252, 13981012, 55924052, 223696212, 894784852, 3579139412, 14316557652, 57266230612, 229064922452, 916259689812, 3665038759252, 14660155037012, 58640620148052, 234562480592212, 938249922368852
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
These numbers have a simple binary pattern: 10,1100,110100,11010100,1101010100, ... i.e. the n-th term has a binary expansion 1(10){n-1}0, that is, there are n-1 10's between the most significant 1 and the least significant 0.
|
|
CROSSREFS
|
a(n) = A072197(n-1) - 1 = A014486(|A106191(n)|). a(n) = A079946(A020988(n-2)) for n>=2. Cf. also A122229.
Sequence in context: A009537 A057547 A043007 this_sequence A007225 A139046 A036359
Adjacent sequences: A080672 A080673 A080674 this_sequence A080676 A080677 A080678
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
N. J. A. Sloane (njas(AT)research.att.com), Mar 02 2003
|
|
EXTENSIONS
|
Further comments added by Antti Karttunen (His-Firstname.His-Surname(AT)gmail.com), Sep 14 2006.
|
|
|
Search completed in 0.002 seconds
|
