|
| |
|
|
A092539
|
|
Binary representation of a(n) equals first n terms of A051023.
|
|
4
| |
|
|
1, 3, 6, 13, 27, 55, 110, 220, 441, 883, 1766, 3532, 7064, 14129, 28258, 56517, 113035, 226070, 452140, 904281, 1808562, 3617124, 7234249, 14468499, 28936999, 57873998, 115747997, 231495994, 462991989, 925983979, 1851967959, 3703935918
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,2
|
|
|
COMMENTS
| a(n+1) = 2*a(n) + d, where d = 0/1 with no obvious rule. The sequence is a digit representation of the central column of cellular automaton Rule 30, A051023. Primes in the sequence, A092540.
|
|
|
LINKS
| Eric Weisstein's World of Mathematics, Rule 30.
|
|
|
FORMULA
| a(n)=FromDigits[Take[A051023, n], 2]
|
|
|
EXAMPLE
| a(6) = 55_10 = 110111_2
|
|
|
MATHEMATICA
| a(n_) := FromDigits[Take[A051023, n], 2]
|
|
|
CROSSREFS
| Cf. A051023, A092540.
Sequence in context: A079403 A065830 A055143 * A094386 A099036 A131246
Adjacent sequences: A092536 A092537 A092538 * A092540 A092541 A092542
|
|
|
KEYWORD
| easy,nonn
|
|
|
AUTHOR
| Zak Seidov (zakseidov(AT)yahoo.com), Feb 27 2004
|
| |
|
|
