|
| |
|
|
A291962
|
|
Decimal repunits written in base 2.
|
|
9
|
|
|
|
0, 1, 1011, 1101111, 10001010111, 10101101100111, 11011001000000111, 100001111010001000111, 101010011000101011000111, 110100111110110101111000111, 1000010001110100011010111000111, 1010010110010001100001100111000111, 1100111011110101111010000000111000111
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
0,3
|
|
|
COMMENTS
|
Interpreting A002275 as binary numbers and converting to decimal gives A000225. This sequence gives the resulting terms of the "reverse" operation.
The n least significant bits of a(n) seem to converge to A088911 as n increases.
|
|
|
LINKS
|
Seiichi Manyama, Table of n, a(n) for n = 0..301
|
|
|
FORMULA
|
a(n) = A007088(A002275(n)).
|
|
|
MATHEMATICA
|
Table[FromDigits@ IntegerDigits[Floor[10^n/9], 2], {n, 0, 12}] (* Michael De Vlieger, Sep 06 2017 *)
|
|
|
PROG
|
(PARI) a(n) = subst(Pol(binary((10^n-1)/9)), x, 10)
(Python)
def a(n): return 0 if n == 0 else int(bin(int("1"*n))[2:])
print([a(n) for n in range(13)]) # Michael S. Branicky, Apr 26 2022
|
|
|
CROSSREFS
|
Cf. A000225, A002275, A007088, A088911.
Sequence in context: A267613 A178396 A178349 * A094946 A158877 A159774
Adjacent sequences: A291959 A291960 A291961 * A291963 A291964 A291965
|
|
|
KEYWORD
|
nonn,base,easy
|
|
|
AUTHOR
|
Felix Fröhlich, Sep 06 2017
|
|
|
STATUS
|
approved
|
| |
|
|
