login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A215501 Inverse of permutation in A215366. 3
1, 2, 3, 4, 5, 6, 8, 7, 9, 10, 13, 11, 20, 14, 15, 12, 31, 16, 46, 17, 21, 22, 68, 18, 23, 32, 24, 25, 98, 26, 140, 19, 33, 47, 34, 27, 196, 69, 48, 28, 273, 35, 374, 36, 37, 99, 509, 29, 49, 38, 70, 50, 685, 39, 51, 40, 100, 141, 916, 41, 1213, 197, 52, 30 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Permutation of the natural numbers A000027 with fixed points 1-6, 9, 10, 14, 15, 21, 22, 33, 49, 1095199, ... and inverse permutation A215366 (with offset 1).

LINKS

Alois P. Heinz, Table of n, a(n) for n = 1..10000

Index entries for sequences that are permutations of the natural numbers

FORMULA

a(n) = A000070(A056239(n)-1)+1 for n in A000040.

a(n) = A000070(A056239(n)) for n in A000079.

A000070(A056239(n)-1) < a(n) <= A000070(A056239(n)).

MAPLE

g:= proc(n, i) option remember; `if`(n=0 or i<2, [2^n], [seq(

      map(p->p*ithprime(i)^j, g(n-i*j, i-1))[], j=0..n/i)]) end:

b:= proc() local l, i; l:=[]; i:=0;

      proc(n) while nops(l)<n do

        l:=[l[], sort(g(i, i))[]]; i:=i+1 od; l[n]

      end

    end():

a:= proc() local t, a; t, a:= 0, proc() -1 end;

      proc(n) local h;

        while a(n) = -1 do

          t:= t+1; h:= b(t);

          if a(h) = -1 then a(h):= t fi

        od; a(n)

      end

    end():

seq(a(n), n=1..100);

CROSSREFS

Cf. A000027, A000040, A000070, A000079, A056239, A215366.

Sequence in context: A266195 A102530 A266196 * A117333 A078840 A333658

Adjacent sequences:  A215498 A215499 A215500 * A215502 A215503 A215504

KEYWORD

nonn,look

AUTHOR

Alois P. Heinz, Aug 13 2012

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 22 22:24 EDT 2020. Contains 337291 sequences. (Running on oeis4.)