A329079 a(n) is the number of entries from a(0) to a(n-2) that have the same number of digits as a(n-1), with a(0) = 0.

0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 0, 11, 1, 12, 2, 13, 3, 14, 4, 15, 5, 16, 6, 17, 7, 18, 8, 19, 9, 20, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50

Offset

0,4

Links

Table of n, a(n) for n=0..72.

Scott R. Shannon, Plot of a(n) for n = 1..10000.

Scott R. Shannon, Plot of a(n) for n = 1..1000000. Note how this is self-similar to the plot for n = 1 to 10000.

Example

a(1) = 0 as there are no entries before a(0).
a(2) = 1 as a(1) = 0 has one digit, and there is one previous entry before a(1) that has one digit.
a(12) = 0 as a(11) = 10 has two digits, and there are no previous entries before a(11) that have two digits.
a(13) = 11 as a(12) = 0 has one digit, and there are eleven previous entries before a(12) that have one digit.

Crossrefs

Cf. A007953, A162146, A327246.

Sequence in context: A097462 A210944 A259434 * A306580 A320486 A321801

Adjacent sequences: A329076 A329077 A329078 * A329080 A329081 A329082

Keyword

nonn,base

Author

Scott R. Shannon, Nov 04 2019

Status

approved