A277832 - cp's OEIS frontend

A277832 Number of '2' digits in the set of all numbers from 0 to A014824(n) = Sum_{i=1..n} i*10^(n-i) = (0, 1, 12, 123, 1234, 12345, ...).

n	a(n)
0	0
1	0
2	2
3	27
4	389
5	5121
6	63553
7	758985
8	8824417
9	100589849
10	1129355281
11	12528120713
12	137626886149
13	1499725651622
14	16231824417465
15	174663923187008
16	1870096021993551
17	19935528121170094
18	211700960224046637
19	2240466392363923180
20	23639231824873799723

[0, 0, 2, 27, 389, 5121, 63553, 758985, 8824417, 100589849, 1129355281, 12528120713, 137626886149, 1499725651622, 16231824417465, 174663923187008, 1870096021993551, 19935528121170094, 211700960224046637, 2240466392363923180, 23639231824873799723]

cp's OEIS Frontend

A277832 Number of '2' digits in the set of all numbers from 0 to A014824(n) = Sum_{i=1..n} i*10^(n-i) = (0, 1, 12, 123, 1234, 12345, ...).

Table of values

List of values