OFFSET
0,2
COMMENTS
About c-equivalent see in comment in A233249.
a(n) is even iff A171791(n+1) is odd - holds for at least the first 1028 terms. The reason, put very briefly, is that: a(n) is even if and only if n is the double of a "fibbinary number". Cf. A267508. [Jörgen Backelin, Jan 15 2016 added by Jeremy Gardiner, Jan 26 2016]
LINKS
EXAMPLE
c-square of 5 in binary is (10)(1)(10)(1)~(10)(10)(1)(1) which is 43 in decimal. So a(5)=43.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Vladimir Shevelev, Dec 07 2013
EXTENSIONS
More terms from Peter J. C. Moses, Dec 07 2013
STATUS
approved