A077433 Number of separating zeros to represent A077431.

0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2

Offset

1,23

Links

Table of n, a(n) for n=1..105.

Formula

a(n) = floor((floor(log_10(2*n^2))+1)/2).

Example

a(256)=3, as A077431(256)=256000256 and A077432(256)=256000256^2=65536'131072'065536; two zeros would not be enough, as 25600256^2 = 65537'31072'65536.

Crossrefs

a(n) = floor(A077430(n)/2).

Sequence in context: A211669 A065687 A300403 * A065685 A084100 A329683

Adjacent sequences: A077430 A077431 A077432 * A077434 A077435 A077436

Keyword

nonn,base

Author

Reinhard Zumkeller, Nov 05 2002

Status

approved