A045998 Binary Gleichniszahlen-Reihe (BGR) sequence: describe previous term (cf. A005150), reduce number of digits seen mod 2 (then for the purposes of this data-base, discard leading zeros).

1, 11, 1, 1011, 111001, 110011, 10001, 10111011, 1110111001, 1110110011, 1110010001, 1100111011, 100111001, 101100110011, 11100100010001, 11001110111011, 1001110111001, 1011001110110011, 111001001110010001

Offset

0,2

Comments

Terms with a leading zero: a(2), a(6), a(12), a(16), a(20), a(28), a(32), a(36), a(40), a(44), a(48), a(60), ...

References

N. Worrick, S. Lewis and B. Shrader, A possible formula for the length of BGR sequences, Graph Theory Notes of New York, XXXVI (1999), p. 25.

Links

Table of n, a(n) for n=0..18.

Example

1, 11, 01, 1011, 111001, 110011, 010001, ... (after 110011, next term is 212021 -> 010001 -> 10001).

Crossrefs

Cf. A005150, A045999, A048522.

Sequence in context: A132098 A223513 A160480 * A287194 A283083 A288401

Adjacent sequences: A045995 A045996 A045997 * A045999 A046000 A046001

Keyword

nonn,base,easy

Author

N. J. A. Sloane

Extensions

More terms from Patrick De Geest, Jun 15 1999

Status

approved