OFFSET
1,1
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
MATHEMATICA
Sort[Plus @@@ Subsets[4^Range[0, 9], {2}]] (* Amiram Eldar, Jul 13 2022 *)
PROG
(Python)
def aupto(limit):
p = [4**i for i in range(limit//4+1) if 4**i < limit]
p2 = set(a+b for i, a in enumerate(p) for b in p[i+1:] if a+b <= limit)
return sorted(p2)
print(aupto(265000)) # Michael S. Branicky, May 17 2021
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
EXTENSIONS
Offset corrected by Amiram Eldar, Jul 13 2022
STATUS
approved