OFFSET
1,2
COMMENTS
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..10000
Gevorg Hmayakyan, Trig identity for a(n)
FORMULA
Product_{j=0..n-1} cos(5^j) = 2^(-n+1)*Sum_{i=2^(n-1)..2^n-1} cos(a(i)). - Gevorg Hmayakyan, Jan 15 2017
Sum_{i=2^(n-1)..2^n-1} cos(a(i)/5^(n-1)*Pi/2) = 0. - Gevorg Hmayakyan, Jan 15 2017
a(n) mod 2 = A030300(n). - Alois P. Heinz, Jan 29 2023
MATHEMATICA
nxt[n_]:=Flatten[5#+{1, -1}&/@n]; Union[Flatten[NestList[nxt, {1}, 5]]] (* Harvey P. Dale, Dec 25 2012 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Jan 02 2009
STATUS
approved