A072725 Integers which are exactly the concatenation of the first m numbers (A007908) divided by their sum (A000217 = m*(m+1)/2).

1, 4, 823

Offset

1,2

Comments

A probability argument suggests that this sequence may be finite.

Links

Table of n, a(n) for n=1..3.

Example

a(1) = 1/1 =1; a(2) = 12/(1+2) = 4; a(3) = 12345/(1+2+3+4+5).

Crossrefs

Cf. A067116, A072723, A072724.

Sequence in context: A239623 A202685 A172893 * A349067 A176186 A332184

Adjacent sequences: A072722 A072723 A072724 * A072726 A072727 A072728

Keyword

base,nonn,bref

Author

Henry Bottomley, Jul 06 2002

Status

approved