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A116169 Numbers k such that k concatenated with k+1 gives the product of two numbers which differ by 9. 8

%I #8 Jul 20 2021 23:46:40

%S 9,49,1166975893986638437392162264780939,

%T 1411174268292962563778302427727571,1860631503683565562655236868895135

%N Numbers k such that k concatenated with k+1 gives the product of two numbers which differ by 9.

%C Also numbers k such that k concatenated with k+9 gives the product of two numbers which differ by 7.

%e 49//50 = 66 * 75, where // denotes concatenation.

%e 49//58 = 67 * 74.

%Y Cf. A116162, A116168, A116175, A116300.

%Y Cf. A116215, A116174, A116223, A116353.

%K nonn,base

%O 1,1

%A _Giovanni Resta_, Feb 06 2006

%E Edited by _N. J. A. Sloane_, Apr 15 2007

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Last modified March 28 21:57 EDT 2024. Contains 371254 sequences. (Running on oeis4.)