A115447 Numbers whose square is the concatenation of two numbers k and k-9.

71, 7235, 9701, 798981, 997001, 35324118, 64675883, 99970001, 3297392379, 6702607622, 7890726434, 8812181189, 9999700001, 897807218979, 917811219179, 979998999801, 999997000001, 46193210013657, 49751928874867

Offset

1,1

Links

Table of n, a(n) for n=1..19.

Example

638370_638361 = 798981^2.

Crossrefs

Cf. A030467, A106497, A115436, A115427, A115438, A115439, A115440, A115441, A115442, A115443, A115444, A115445, A115446.

Sequence in context: A221051 A239718 A279904 * A200960 A260034 A250974

Adjacent sequences: A115444 A115445 A115446 * A115448 A115449 A115450

Keyword

base,nonn

Author

Giovanni Resta, Jan 25 2006

Status

approved