A116286 Numbers k such that k*(k+2) gives the concatenation of a number m with itself.

9, 99, 427, 572, 726, 845, 999, 7809, 9999, 36364, 63635, 99999, 326733, 673266, 999999, 4545453, 5454546, 9999999, 47058822, 52941177, 99999999, 331983806, 332667333, 384615385, 422892897, 475524476, 524475523, 577107102

Offset

1,1

Links

Table of n, a(n) for n=1..28.

Crossrefs

Cf. A116136, A116279, A116285, A116287, A116295.

Sequence in context: A284691 A147829 A116274 * A306449 A160946 A359078

Adjacent sequences: A116283 A116284 A116285 * A116287 A116288 A116289

Keyword

nonn,base

Author

Giovanni Resta, Feb 06 2006

Status

approved