0,2

In binary expansion, 1-bits occur only in groups of two or more, separated from other such groups by at least two 0-bits.

Integers that satisfy A048727(n) = 3*n.

Table of n, a(n) for n=0..47.

Index entries for sequences defined by congruent products between domains N and GF(2)[X]

Row 3 of A115872. Superset of A048719. Cf. A048733.

Sequence in context: A028792 A144795 A077459 * A175332 A022434 A242666

Adjacent sequences: A048714 A048715 A048716 * A048718 A048719 A048720

nonn,easy

Antti Karttunen, 30.3.1999

approved