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Numbers k such that k and k+1 are both admirable numbers (A111592).
2

%I #10 Aug 06 2023 09:52:48

%S 29691198404,478012798575,2789405835075,22929723392715

%N Numbers k such that k and k+1 are both admirable numbers (A111592).

%C a(1)-a(2) were found by _Giovanni Resta_.

%H Giovanni Resta, <a href="http://www.numbersaplenty.com/set/admirable_number/">admirable numbers</a>, Numbers Aplenty.

%Y Subsequence of A096399 and A111592.

%Y Cf. A109729, A109730.

%K nonn,hard,more

%O 1,1

%A _Amiram Eldar_, Aug 05 2023

%E a(4) from _Martin Ehrenstein_, Aug 06 2023