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A116288 Numbers k such that k*(k+4) gives the concatenation of a number m with itself. 5
7, 97, 451, 546, 689, 854, 997, 4380, 5617, 9997, 72728, 99997, 346531, 653466, 999997, 9090906, 9999997, 94117644, 99999997, 334665331, 336032385, 378253326, 390977440, 439928489, 483516484, 516483513, 560071508 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..27.

CROSSREFS

Cf. A116125, A116275, A116287, A116289, A116297.

Sequence in context: A090687 A116125 A142315 * A219088 A116261 A289851

Adjacent sequences:  A116285 A116286 A116287 * A116289 A116290 A116291

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, Feb 06 2006

STATUS

approved

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Last modified May 29 02:45 EDT 2022. Contains 354122 sequences. (Running on oeis4.)