|
Search: id:A154703
|
|
|
| A154703 |
|
Concatenation of the first n primes written in base 2. |
|
+0
1
|
|
| 10, 1011, 1011101, 1011101111, 10111011111011, 1011101111101110001, 1011101111101110001, 101110111110111000110011, 10111011111011100011001110111, 1011101111101110001100111011111101
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
Number of bits in a(n) = SUM[i=1..n] A035100(i) = 2, 4, 7, 10, 14, 18, 23, 28, 33, 38, 43, 49, 55, 61, 67, 73, 79, 85, 92, ....
|
|
FORMULA
|
a(n) = CONCATENATE[i=1..n] A004676(i) = CONCATENATE[i=1..n] A007088(A000040(i)). a(1) = 10, a(n+1) = a(n) CONCATENATE A007088(A000040(i)).
|
|
EXAMPLE
|
a(2) = 1011 = 10 Concat 11 = (2 base 2) Concat (3 base 2).
|
|
CROSSREFS
|
Cf. A000040, A004676, A007088, A035100.
Sequence in context: A138484 A022506 A127117 this_sequence A067104 A166507 A103623
Adjacent sequences: A154700 A154701 A154702 this_sequence A154704 A154705 A154706
|
|
KEYWORD
|
base,easy,nonn
|
|
AUTHOR
|
Jonathan Vos Post (jvospost3(AT)gmail.com), Jan 14 2009
|
|
|
Search completed in 0.002 seconds
|
