A073030 Sum_{k=1..n, gcd(n,k) = 1} 10^(k-1).

1, 11, 101, 1111, 10001, 111111, 1010101, 11011011, 101000101, 1111111111, 10001010001, 111111111111, 1010100010101, 11010011001011, 101010101010101, 1111111111111111, 10001010001010001, 111111111111111111

Offset

2,2

Comments

A054431 is concatenation of a(n).

Links

Table of n, a(n) for n=2..19.

Crossrefs

Cf. A054431, A054432.

Sequence in context: A290111 A193707 A006943 * A290295 A209930 A203304

Adjacent sequences: A073027 A073028 A073029 * A073031 A073032 A073033

Keyword

nonn

Author

Vladeta Jovovic, Aug 15 2002

Status

approved