|
| |
|
|
A071790
|
|
Decimal expansion of the second (of 10) decimal selvage numbers; the n-th digit of a decimal selvage number, x, is equal to the tens digit of n*x.
|
|
5
| |
|
|
2, 4, 7, 9, 2, 4, 7, 9, 2, 4, 7, 9, 2, 4, 7, 9, 2, 4, 7, 9, 2, 4, 7, 9, 1, 4, 6, 9, 1, 4, 6, 9, 1, 4, 6, 9, 1, 4, 6, 9, 1, 4, 6, 9, 1, 4, 6, 9, 1, 3, 6, 8, 1, 3, 6, 8, 1, 3, 6, 8, 1, 3, 6, 8, 1, 3, 6, 8, 1, 3, 6, 8, 0, 3, 5, 8, 0, 3, 5, 8, 0, 3, 5, 8, 0, 3, 5, 8, 0, 3, 5, 8, 0, 3, 5, 8, 0, 2, 5, 7
(list; constant; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 0,1
|
|
|
COMMENTS
| The selvage number, x = sum{k=1..inf} a(k)/10^k, is a normal number, but it is not known whether or not x is irrational. Is this sequence periodic?
|
|
|
FORMULA
| a(n) = floor[10*(n*x)] (Mod 10), where x = sum{k=1..inf} a(k)/10^k.
|
|
|
EXAMPLE
| a(8) = 9 since floor(10*(8*x)) = 9, x=.24792479247924792479247914691469146914691469146913...
|
|
|
CROSSREFS
| Sequence in context: A122980 A012985 A094446 * A199465 A081249 A047541
Adjacent sequences: A071787 A071788 A071789 * A071791 A071792 A071793
|
|
|
KEYWORD
| nonn,cons,base,nice
|
|
|
AUTHOR
| Paul D. Hanna (pauldhanna(AT)juno.com), Jun 06 2002
|
| |
|
|
