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A103756
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Number of contiguous digits i in the counting numbers, for i=2.
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0
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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; internal format)
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OFFSET
| 1,5
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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").
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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.
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CROSSREFS
| Sequence in context: A172972 A175739 A094404 * A103755 A202150 A093818
Adjacent sequences: A103753 A103754 A103755 * A103757 A103758 A103759
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KEYWORD
| nonn,base
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AUTHOR
| Alexandre Wajnberg (alexandre.wajnberg(AT)ulb.ac.be), Mar 28 2005
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