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A128684 Numbers k such that k^3 divides 11^(k^2) + 1. 20

%I #11 Jun 08 2021 02:22:27

%S 1,3,111,24753,1770231,23401797,39402669,65498547,298100379,440377293,

%T 1788478509,5218600731,8786795187,14606175981,24342867543,45340639419,

%U 98204136339,5032808252679,5293823142513,6241891310439,7013907181779

%N Numbers k such that k^3 divides 11^(k^2) + 1.

%C 3 divides a(n) for n > 1.

%t Select[Range[5*10^6], Mod[ 11^(#^2)+1, #^3]==0 &] (* _G. C. Greubel_, Jan 18 2018 *)

%Y Cf. A127263, A128677, A128678, A128679, A128680, A128681, A128682, A128683, A128685.

%K nonn

%O 1,2

%A _Alexander Adamchuk_, Mar 31 2007

%E a(5) from J. Mulder (jasper.mulder(AT)planet.nl), Jan 26 2010

%E Terms from a(6) onward from _Max Alekseyev_, May 14 2010

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Last modified March 28 22:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)