A255833 Index i such that A166133(i)=n, or 0 if no such i exists.
1, 2, 4, 3, 8, 7, 6, 5, 12, 11, 10, 9, 16, 15, 14, 13, 21, 20, 19, 18, 17, 24, 23, 22, 29, 28, 27, 26, 40, 39, 38, 37, 36, 35, 34, 33, 32, 31, 30, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 25
Offset: 1
Keywords
Links
- M. F. Hasler, Table of n, a(n) for n = 1..10000
- Ray Chandler, Table of n, a(n) for n=1..3743853 (55 MB)
Programs
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Haskell
import Data.List (elemIndex); import Data.Maybe (fromJust) a255833 = (+ 1) . fromJust . (`elemIndex` a166133_list) -- Reinhard Zumkeller, Apr 02 2015
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PARI
a(n)=for(i=1,#a166133,a166133[i]==n&&return(i)) \\ assumes a166133 defined as a vector, e.g., via {c=0; a166133=apply(t->eval(concat(Vec(t)[1+#Str(c++) .. -1])), readstr("/tmp/b166133.txt"))}
Extensions
Definition simplified by Franklin T. Adams-Watters, Apr 01 2015
Comments