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Conjectured to be the numbers that do not appear in A006509.
2

%I #10 Mar 07 2024 10:37:50

%S 5,7,8,9,10,13,14,17,20,21,22,23,25,27,28,30,31,33,37,39,40,41,42,43,

%T 45,46,47,48,49,50,51,53,54,55,57,58,59,60,64,65,66,69,72,74,75,78,79,

%U 82,86,87,88,89,90,91,92,93,95,96,97,99,101,102,103,104,105,107,108,109

%N Conjectured to be the numbers that do not appear in A006509.

%C Conjectured to be the complement of A111338.

%C There is no known proof that any of these terms is missing from A006509. - _N. J. A. Sloane_, Mar 06 2024

%C 5 does not appear in the first 10^8 terms of A006509. - _Robert C. Lyons_, Mar 06 2024

%Y Cf. A111338, A006509.

%K nonn,hard

%O 1,1

%A _Klaus Brockhaus_, Nov 02 2005

%E Edited by _N. J. A. Sloane_, Mar 06 2024