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A116286 Numbers k such that k*(k+2) gives the concatenation of a number m with itself. 5

%I

%S 9,99,427,572,726,845,999,7809,9999,36364,63635,99999,326733,673266,

%T 999999,4545453,5454546,9999999,47058822,52941177,99999999,331983806,

%U 332667333,384615385,422892897,475524476,524475523,577107102

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

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

%K nonn,base

%O 1,1

%A _Giovanni Resta_, Feb 06 2006

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Last modified August 7 23:50 EDT 2022. Contains 355995 sequences. (Running on oeis4.)