a(0) = 0; for n>0, a(n) = period length of the decimal expansion of the number Sum_{i>=1} 2^(-n*i). Also period length of the fractions 1/b(n), where b(n) = 2*b(n-1) + 1, with b(1)=1.
A136273
a(0) = 0; for n>0, a(n) = period length of the decimal expansion of the number Sum_{i>=1} 2^(-n*i). Also period length of the fractions 1/b(n), where b(n) = 2*b(n-1) + 1, with b(1)=1.
Terms
- a(0) =0a(1) =1a(2) =6a(3) =1a(4) =15a(5) =6a(6) =42a(7) =16a(8) =24a(9) =30a(10) =44a(11) =6a(12) =1365a(13) =42a(14) =150a(15) =256a(16) =3855a(17) =72a(18) =74898a(19) =30a(20) =336a(21) =1364a(22) =44620a(23) =240a(24) =900a(25) =2730a(26) =262656a(27) =336a(28) =39672a(29) =1650
External references
- oeis: A136273