A128757 Inverse permutation to A128756.

9, 5, 2, 11, 10, 1, 4, 23, 8, 20, 6, 7, 24, 3, 12, 27, 14, 64, 21, 13, 16, 17, 18, 41, 49, 15, 26, 33, 28, 32, 22, 25, 30, 29, 38, 19, 39, 53, 34, 59, 36, 35, 40, 37, 42, 72, 44, 31, 95, 45, 46, 43, 52, 56, 48, 51, 75, 47, 66, 85, 58, 55, 54, 57, 71, 61, 50, 63, 87, 65, 62, 78

Offset: 1

Author

Ferenc Adorjan (fadorjan(AT)freemail.hu or ferencadorjan(AT)gmail.com), Mar 24 2007

Keywords

• nonn

Comments

Seemingly the inversion maintains the characteristics of being an "infinite braid".

Links

• Ferenc Adorjan, Table of n,a(n) for n=1..10000
• Index entries for sequences that are permutations of the natural numbers

Crossrefs

Inverse of A128756, cf. A128754, A128755 and A000959.

Programs

PARI

{pinverse(v)= /* Permutation inverse of a positive sequence */
local(n,m,x);n=matsize(v)[2]; x=vector(n);
for(i=1,n,if(v[i]<=n,x[v[i]]=i)); return(x)}
a=pinverse(A128756)