A109855 Concatenation of the terms gives natural numbers in sequence such that N-th partial concatenation is a multiple of n.

1, 2, 3, 456, 78910, 1112, 13141516171819202122, 232425262728, 29303132333435, 3637383940, 4142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106

Offset

1,2

Comments

Not all the later terms are so big: a(14) = 114 and a(24) = 272, for example. - Joshua Zucker, May 04 2006

Links

Table of n, a(n) for n=1..11.

Example

123456 is a multiple of 4.

Crossrefs

Cf. A109856.

Sequence in context: A156986 A066849 A071219 * A306370 A355644 A128874

Adjacent sequences: A109852 A109853 A109854 * A109856 A109857 A109858

Keyword

base,nonn

Author

Amarnath Murthy, Jul 08 2005

Extensions

Corrected and extended by Joshua Zucker, May 04 2006

Offset corrected by Andrew Howroyd, Sep 17 2024

Status

approved