|
Search: id:A131551
|
|
|
| A131551 |
|
Least power of 3 having exactly n consecutive 2's in its decimal representation. |
|
+0
1
|
|
| 3, 19, 148, 253, 330, 2380, 2124, 30598, 22791, 238582
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
EXAMPLE
|
a(3)=148 because 3^148(i.e. 41109831670569663658300086939077404909608122265524774868353822811305361) is the smallest power of 3 to contain a run of 3 consecutive twos in its decimal form.
|
|
MATHEMATICA
|
a = ""; Do[ a = StringJoin[a, "2"]; b = StringJoin[a, "2"]; k = 1; While[ StringPosition[ ToString[3^k], a] == {} || StringPosition[ ToString[3^k], b] != {}, k++ ]; Print[k], {n, 1, 10} ]
|
|
CROSSREFS
|
Sequence in context: A080833 A073516 A005258 this_sequence A074546 A054316 A006289
Adjacent sequences: A131548 A131549 A131550 this_sequence A131552 A131553 A131554
|
|
KEYWORD
|
more,nonn,base
|
|
AUTHOR
|
Shyam Sunder Gupta (guptass(AT)rediffmail.com), Aug 26 2007
|
|
|
Search completed in 0.002 seconds
|
