|
| |
|
|
A133375
|
|
Catalan numbers with digits sorted in increasing order and zeros suppressed.
|
|
0
| |
|
|
1, 1, 2, 5, 14, 24, 123, 249, 134, 2468, 16679, 56788, 1228, 2479, 244467, 4456899, 3355677, 12446799, 3467778, 112366779, 12244566, 222446667, 1234456689, 1333455669, 112234447899
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 0,3
|
|
|
COMMENTS
| This is to A000108 as A135374 is to A000225 and as A078726 is to A000215. Of the values through a(24), the only primes are the two prime Catalan numbers 2 and 5. What is the first prime in this sequence which is not an untransformed Catalan number?
|
|
|
FORMULA
| A004185(A000108(n)) = A004185((2n)!/(n!(n+1)!)).
|
|
|
MATHEMATICA
| Table[FromDigits[Sort[DeleteCases[IntegerDigits[CatalanNumber[n]], 0]]], {n, 0, 30}] (* From Harvey P. Dale, Nov 01 2011 *)
|
|
|
CROSSREFS
| Cf. A000108, A004185, A078726, A135374.
Sequence in context: A131661 A076664 A049939 * A057295 A100779 A194124
Adjacent sequences: A133372 A133373 A133374 * A133376 A133377 A133378
|
|
|
KEYWORD
| base,easy,nonn,less
|
|
|
AUTHOR
| Jonathan Vos Post (jvospost3(AT)gmail.com), Dec 21 2007
|
| |
|
|
