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A045609 Numbers k that divide 10^k + 9^k. 0

%I

%S 1,19,361,6859,80161,130321,142253,231059,1523059,1555207,2476099,

%T 2702807,4390121,28938121,29548933,47045881,51353333,83412299,

%U 188190383,338199259,549824299,561429727,600165407,893871739,974837921

%N Numbers k that divide 10^k + 9^k.

%t Select[ Range[ 10^9 ], Mod[ PowerMod[ 10, #, # ] + PowerMod[ 9, #, # ], # ] == 0 & ]

%K nonn

%O 1,2

%A _David W. Wilson_

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Last modified May 15 23:51 EDT 2022. Contains 353687 sequences. (Running on oeis4.)