OFFSET
1,3
EXAMPLE
From Omar E. Pol, Jul 21 2009: (Start)
If written as a triangle:
1;
1,4;
1,4,4,16;
1,4,4,16,4,16,16,64;
1,4,4,16,4,16,16,64,4,16,16,64,16,64,64,256;
1,4,4,16,4,16,16,64,4,16,16,64,16,64,64,256,4,16,16,64,16,64,64,256,16,64,...
(End)
PROG
(Python 3.10+)
def A151783(n): return 1<<(n.bit_count()-1<<1) # Chai Wah Wu, Nov 15 2022
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jun 25 2009
STATUS
approved