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A135612
Even superperfect numbers divided by 2, written in base 2.
0
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.
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
KEYWORD
base,nonn
AUTHOR
Omar E. Pol, Mar 01 2008
STATUS
approved