12345678910
domain: N
Appears in sequences
- Blocks of increasing length using 1,2,3,...,9,10; omit leading 0's.at n=10A001369
- Triangle of the gods: to get a(n), concatenate the decimal numbers 1,2,3,...,n.at n=9A007908
- a(n) is the concatenation of the phi(n) numbers between 1 and n that are relatively prime to n.at n=10A061097
- Terms of A007908 which are divisible by their index.at n=6A071269
- Smallest multiple of n which begins with the concatenation of first n natural numbers.at n=9A074158
- Smallest multiple of n formed by the concatenation of n successive numbers, or 0 if no such number exists.at n=9A077306
- a(n) = numerator of fraction a/b, where gcd(a, b) = 1, whose decimal representation has the form 0.(1)(2)(3)...(n-1)(n)... with period (1)(2)(3)...(n-1)(n).at n=9A172496
- Concatenation of the first n numbers in base n.at n=8A179075
- a(n) is the concatenation of first n terms of A033307.at n=10A252043
- Concatenation of the numbers from 1 to n but omitting 11.at n=9A262581
- Concatenation of the numbers from 1 to n but omitting 12.at n=9A262582
- Square array A(m,n) = concatenation of { m, m+1, ..., m+n }, with m, n >= 1, read by falling antidiagonals.at n=36A285807
- Concatenation {n, n + 1,.., n + 9}.at n=0A287747
- a(n) is the smallest multiple of n formed by the concatenation 1,2,3,...,k for some k.at n=9A334620