A116273 Numbers k such that k*(k+2) gives the concatenation of two numbers m and m-2.

90, 9078, 9900, 733673, 999000, 88225294, 99990000, 8900869207, 9296908811, 9604060396, 9999900000, 326666333266, 673333666733, 700730927007, 972603739726, 999999000000, 34519562953736, 39737862788837

Offset

1,1

Links

Table of n, a(n) for n=1..18.

Example

90 is a member since 90*92 = 8280 = 82 80.
9078 is a member since 9078*9080 = 82428240 = 8242 8240.

Crossrefs

Cf. A054214, A116266, A116272, A116274, A116279.

Sequence in context: A216706 A166822 A166804 * A036257 A276352 A203779

Adjacent sequences: A116270 A116271 A116272 * A116274 A116275 A116276

Keyword

nonn,base

Author

Giovanni Resta, Feb 06 2006

Status

approved