A277837 - cp's OEIS frontend

A277837 Number of '7' 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	1
3	22
4	343
5	4664
6	58985
7	713307
8	8367637
9	96022049
10	1083677281
11	12071340713
12	133059086145
13	1454047651577
14	15775044417009
15	170096123182441
16	1824418021947873
17	19478748120713314
18	207133160219478837
19	2194788392318245180
20	23182451824417019723

[0, 0, 1, 22, 343, 4664, 58985, 713307, 8367637, 96022049, 1083677281, 12071340713, 133059086145, 1454047651577, 15775044417009, 170096123182441, 1824418021947873, 19478748120713314, 207133160219478837, 2194788392318245180, 23182451824417019723]

cp's OEIS Frontend

A277837 Number of '7' 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