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A103756 Number of contiguous digits i in the counting numbers, for i=2. 0
1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 2, 5, 2, 2, 2, 2, 2, 2, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

COMMENTS

Write the natural numbers as an infinite sequence of digits, starting at the left; and count the digits of each group of "2"'s you encounter (the smallest "groups" have one "2").

LINKS

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

EXAMPLE

a(1)=1: the first "2" of the counting numbers, isolated.

a(2)=1: the second "2", second digit of number 12, isolated.

a(3)=1 the first digit of number 20, isolated.

a(4)=1: the first digit of number 21, isolated.

a(5)=3: two "2"'s of 22 followed by one "2" of 23 = three "2"'s, the next group of "2"'s.

CROSSREFS

Sequence in context: A175739 A260196 A094404 * A103755 A326538 A333844

Adjacent sequences:  A103753 A103754 A103755 * A103757 A103758 A103759

KEYWORD

nonn,base

AUTHOR

Alexandre Wajnberg, Mar 28 2005

STATUS

approved

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Last modified March 7 18:46 EST 2021. Contains 341915 sequences. (Running on oeis4.)