A292267 Restricted growth sequence transform of A292268; filter combining multiplicative order of 2 mod 2n+1 and the number of trailing 1's in binary expansion of 2n+1.

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 5, 11, 12, 10, 13, 14, 15, 16, 17, 18, 12, 19, 7, 20, 21, 22, 23, 24, 25, 26, 27, 28, 7, 29, 30, 31, 32, 33, 34, 35, 36, 37, 9, 38, 39, 16, 15, 40, 41, 42, 43, 44, 7, 45, 17, 46, 13, 47, 7, 48, 49, 33, 43, 50, 51, 52, 25, 53, 54, 55, 56, 57, 13, 58, 59, 60, 61, 33, 23, 62, 63, 64, 12, 65, 66, 10, 67, 57, 68, 69, 70, 71, 17, 72, 25

Offset

0,2

Links

Antti Karttunen, Table of n, a(n) for n = 0..32768

Prog

(PARI)
allocatemem(2^30);
rgs_transform(invec) = { my(om = Map(), outvec = vector(length(invec)), u=1); for(i=1, length(invec), if(mapisdefined(om, invec[i]), my(pp = mapget(om, invec[i])); outvec[i] = outvec[pp] , mapput(om, invec[i], i); outvec[i] = u; u++ )); outvec; };
write_to_bfile(start_offset, vec, bfilename) = { for(n=1, length(vec), write(bfilename, (n+start_offset)-1, " ", vec[n])); }
A002326(n) = if(n<0, 0, znorder(Mod(2, 2*n+1))); \\ This function from Michael Somos, Mar 31 2005
A007814(n) = valuation(n, 2);
A292268(n) = (1/2)*(2 + ((A002326(n)+A007814(2*(1+n)))^2) - A002326(n) - 3*A007814(2*(1+n)));
write_to_bfile(0, rgs_transform(vector(32769, n, A292268(n-1))), "b292267_upto32768.txt");

Crossrefs

Cf. A002326, A007814, A292268.

Cf. A291766, A291769 for related filters.

Sequence in context: A319707 A319717 A292266 * A365392 A305810 A171060

Adjacent sequences: A292264 A292265 A292266 * A292268 A292269 A292270

Keyword

nonn

Author

Antti Karttunen, Oct 02 2017

Status

approved