The OEIS is supported by the many generous donors to the OEIS Foundation.
%I #3 Aug 31 2017 23:36:35
%S 1,2,4,2,5,4,5
%N Appears to be an erroneous version of A019294.
%C Included in accordance with OEIS policy of including published but incorrect versions of sequences.
%D Richard K. Guy, Unsolved Problems in Number Theory, 3rd Edition, Springer, 2004. See Section B41, p. 147.
%K dead
%O 1,2