A135612 Even superperfect numbers divided by 2, written in base 2.

1, 10, 1000, 100000, 100000000000, 1000000000000000, 100000000000000000, 100000000000000000000000000000, 100000000000000000000000000000000000000000000000000000000000

Offset

1,2

Comments

Also, concatenation of "1" and A000043(n)-2 digits "0".

The number of divisors of a(n) is equal to the number of its digits. This number is equal to A090748(n)=A000043(n)-1.

Links

Table of n, a(n) for n=1..9.

Formula

a(n)=A134708(n) written in base 2.

Example

a(3)=1000 because A134708(n)=8 and 8 written in base 2 is 1000.

Crossrefs

Even superperfect numbers divided by 2: A134708. Cf. A000043, A019279, A090748, A135651, A135656.

Sequence in context: A171500 A154027 A013715 * A110147 A215023 A071925

Adjacent sequences: A135609 A135610 A135611 * A135613 A135614 A135615

Keyword

base,nonn

Author

Omar E. Pol, Mar 01 2008

Status

approved