A105311 a(n) = n concatenations of numbers from 1 to n, concatenated.

1, 1212, 123123123, 1234123412341234, 1234512345123451234512345, 123456123456123456123456123456123456, 1234567123456712345671234567123456712345671234567, 1234567812345678123456781234567812345678123456781234567812345678, 123456789123456789123456789123456789123456789123456789123456789123456789123456789

Offset

1,2

References

F. Smarandache, "Properties of the numbers", Univ. of Craiova Archives, 1975; Arizona State University Special Collections, Tempe, AZ.

Links

Table of n, a(n) for n=1..9.

Eric Weisstein's World of Mathematics, Smarandache Sequences.

Crossrefs

Cf. A098129, A000461.

Sequence in context: A250159 A184464 A204331 * A252125 A251815 A130680

Adjacent sequences: A105308 A105309 A105310 * A105312 A105313 A105314

Keyword

easy,nonn,base

Author

Alexandre Wajnberg, Apr 25 2005

Extensions

a(5) corrected and more terms from Georg Fischer, Nov 13 2024

Status

approved