OFFSET
1,2
COMMENTS
If the word "even" is omitted the sequence is A230303.
The next term is a(7) = 2^4233 + 130.
EXAMPLE
The smallest number with two inverses is 14: the inverses are 11 = 1011_2 which maps to 11+3 = 14, and 12 = 1100_2 which maps to 12+2 = 14.
CROSSREFS
KEYWORD
nonn
AUTHOR
Max Alekseyev and N. J. A. Sloane, May 13 2016
STATUS
approved