A105310 a(n) = concatenation of i n times, with i = 1 to n.

1, 1122, 111222333, 1111222233334444, 1111122222333334444455555, 111111222222333333444444555555666666, 1111111222222233333334444444555555566666667777777

Offset: 21

Author

Alexandre Wajnberg, Apr 25 2005

Keywords

• base
• easy
• nonn
• less

Examples

			a(10)=concatenation of (1^10)(2^10)(3^10)...(9^10)(10^10)
		

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.