A152756 Bisection of A000533.

1, 101, 10001, 1000001, 100000001, 10000000001, 1000000000001, 100000000000001, 10000000000000001, 1000000000000000001, 100000000000000000001, 10000000000000000000001

Offset

1,2

Comments

a(1)=1, for n>1, a(n) is the concatenation of "1", 2(n-1)-1 digits "0" and "1". [From Omar E. Pol, Dec 14 2008]

Links

Table of n, a(n) for n=1..12.

Formula

Except the first term, a(n)=10^(2n)+1. - Robert G. Wilson v, Dec 14 2008

G.f.: (1-100*x^2)/(1-x)/(1-100*x)) - Robert Israel, Jul 27 2014

Example

n ..... a(n)
1 ....... 1
2 ...... 101
3 ..... 10001
4 .... 1000001
5 ... 100000001

Prog

(Magma) [1] cat [10^(2*n)+1: n in [1..15]]; // Vincenzo Librandi, Jul 27 2014

Crossrefs

Cf. A000533, A135577, A138120, A138146.

Sequence in context: A333689 A291990 A303572 * A265172 A153500 A262861

Adjacent sequences: A152753 A152754 A152755 * A152757 A152758 A152759

Keyword

easy,nonn,less

Author

Omar E. Pol, Dec 13 2008

Status

approved