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

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

Offset: 1

Author

Alexandre Wajnberg, Apr 25 2005

Keywords

• easy
• nonn
• base

References

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

Links

• Eric Weisstein's World of Mathematics, Smarandache Sequences.

Crossrefs

Cf. A098129, A000461.

Extensions

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