|
Search: id:A006715
|
|
|
| A006715 |
|
Describe the previous term! (method A - initial term is 3).
(Formerly M2965)
|
|
+0
22
|
|
| 3, 13, 1113, 3113, 132113, 1113122113, 311311222113, 13211321322113, 1113122113121113222113, 31131122211311123113322113, 132113213221133112132123222113
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
Method A = 'frequency' followed by 'digit'-indication.
|
|
REFERENCES
|
J. H. Conway, The weird and wonderful chemistry of audioactive decay, in T. M. Cover and Gopinath, eds., Open Problems in Communication and Computation, Springer, NY 1987, pp. 173-188.
S. R. Finch, Mathematical Constants, Cambridge, 2003, pp. 452-455.
I. Vardi, Computational Recreations in Mathematica. Addison-Wesley, Redwood City, CA, 1991, p. 4.
|
|
LINKS
|
S. R. Finch, Conway's Constant
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
|
|
EXAMPLE
|
E.g. the term after 3113 is obtained by saying "one 3, two 1's, one 3", which gives 132113.
|
|
MATHEMATICA
|
RunLengthEncode[ x_List ] := (Through[ {First, Length}[ #1 ] ] &) /@ Split[ x ]; LookAndSay[ n_, d_:1 ] := NestList[ Flatten[ Reverse /@ RunLengthEncode[ # ] ] &, {d}, n - 1 ]; F[ n_ ] := LookAndSay[ n, 3 ][ [ n ] ]; Table[ FromDigits[ F[ n ] ], {n, 1, 11} ] - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Mar 21 2007
|
|
CROSSREFS
|
Cf. A001155, A005150, A006751, A001140, A001141, A001143, A001145, A001151, A001154.
Adjacent sequences: A006712 A006713 A006714 this_sequence A006716 A006717 A006718
Sequence in context: A092540 A118628 A112513 this_sequence A138487 A022507 A108583
|
|
KEYWORD
|
nonn,base,easy,nice
|
|
AUTHOR
|
N. J. A. Sloane (njas(AT)research.att.com).
|
|
|
Search completed in 0.002 seconds
|
