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A077433 Number of separating zeros to represent A077431. 2
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 (list; graph; refs; listen; history; text; internal format)
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 * A211665 A065685 A084100

Adjacent sequences:  A077430 A077431 A077432 * A077434 A077435 A077436

KEYWORD

nonn,base

AUTHOR

Reinhard Zumkeller, Nov 05 2002

STATUS

approved

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Last modified May 30 16:19 EDT 2020. Contains 334726 sequences. (Running on oeis4.)