A332811 a(n) = A243071(A332808(n)).

0, 1, 3, 2, 7, 6, 15, 4, 5, 14, 63, 12, 31, 30, 13, 8, 127, 10, 255, 28, 29, 126, 1023, 24, 11, 62, 9, 60, 511, 26, 4095, 16, 125, 254, 27, 20, 2047, 510, 61, 56, 8191, 58, 16383, 252, 25, 2046, 65535, 48, 23, 22, 253, 124, 32767, 18, 123, 120, 509, 1022, 262143, 52, 131071, 8190, 57, 32, 59, 250, 1048575, 508, 2045, 54, 4194303, 40, 524287, 4094, 21

Offset

1,3

Links

Antti Karttunen, Table of n, a(n) for n = 1..16384

Index entries for sequences that are permutations of the natural numbers

Formula

a(n) = A243071(A332808(n)).

For n > 1, a(n) = A054429(A332816(n)).

a(n) = A332895(n) + A332896(n).

a(n) = A332895(n) OR A332896(n) = A332895(n) XOR A332896(n).

A000120(a(n)) = A332899(n).

Prog

(PARI)
up_to = 26927;
A064989(n) = {my(f); f = factor(n); if((n>1 && f[1, 1]==2), f[1, 2] = 0); for (i=1, #f~, f[i, 1] = precprime(f[i, 1]-1)); factorback(f)};
A243071(n) = if(n<=2, n-1, if(!(n%2), 2*A243071(n/2), 1+(2*A243071(A064989(n)))));
A332806list(up_to) = { my(v=vector(2), xs=Map(), lista=List([]), p, q, u); v[2] = 3; v[1] = 5; mapput(xs, 1, 1); mapput(xs, 2, 2); mapput(xs, 3, 3);  for(n=4, up_to, p = v[2-(n%2)]; q = nextprime(1+p); while(q%4 != p%4, q=nextprime(1+q)); v[2-(n%2)] = q; mapput(xs, primepi(q), n)); for(i=1, oo, if(!mapisdefined(xs, i, &u), return(Vec(lista)), listput(lista, prime(u)))); };
v332806 = A332806list(up_to);
A332806(n) = v332806[n];
A332808(n) = { my(f=factor(n)); f[, 1] = apply(A332806, apply(primepi, f[, 1])); factorback(f); };
A332811(n) = A243071(A332808(n));

Crossrefs

Cf. A332817 (inverse permutation).

Cf. A054429, A243071, A332808, A332816, A332895, A332896, A332899.

Cf. also A332215.

Sequence in context: A269386 A252756 A243071 * A377834 A286556 A243354

Adjacent sequences: A332808 A332809 A332810 * A332812 A332813 A332814

Keyword

nonn

Author

Antti Karttunen, Mar 05 2020

Status

approved