A330639 A "Fractal Jump Sequence" (FJS) that reappears twice (itself and itself*2; see the Comments section).

1, 2, 2, 4, 4, 2, 8, 8, 4, 4, 16, 16, 8, 4, 8, 32, 32, 16, 2, 8, 16, 8, 64, 64, 32, 4, 16, 32, 16, 128, 8, 128, 64, 8, 32, 64, 32, 256

Offset

1,2

Comments

Start on a(1) = 1 and underline it;

from there, jump over 1 term to the right; you land on a(3) = 2, which you underline;

from there, jump over 2 terms to the right; you'll land on a(6) = 2, which you underline;

from there, jump over 2 terms to the right; you'll land on a(9) = 4, which you underline;

from there, jump over 4 terms to the right; you'll land on a(14) = 4, which you underline;

from there, jump over 4 terms to the right; you'll land on a(19) = 2, which you underline; etc.

The underlined terms reproduce the starting sequence. The not underlined terms are the successive terms of the starting sequence multiplied by 2.

Links

Table of n, a(n) for n=1..38.

Crossrefs

Cf. A105496 (adding 1 instead of multiplying by 2 the non-underlined terms).

Sequence in context: A128442 A290633 A038674 * A339179 A182923 A263856

Adjacent sequences: A330636 A330637 A330638 * A330640 A330641 A330642

Keyword

base,nonn,more

Author

Eric Angelini, Dec 22 2019

Status

approved