A038484 Sums of 2 distinct powers of 8.

9, 65, 72, 513, 520, 576, 4097, 4104, 4160, 4608, 32769, 32776, 32832, 33280, 36864, 262145, 262152, 262208, 262656, 266240, 294912, 2097153, 2097160, 2097216, 2097664, 2101248, 2129920, 2359296, 16777217, 16777224, 16777280, 16777728, 16781312, 16809984, 17039360, 18874368

Offset: 1

Author

Olivier Gérard

Keywords

• nonn
• easy

Links

• Amiram Eldar, Table of n, a(n) for n = 1..10000

Crossrefs

Base-8 interpretation of A038444.

Cf. A001018, A038485, A038486.

Programs

Mathematica

Total/@Subsets[8^Range[0,10],{2}]//Union (* Harvey P. Dale, Jul 04 2022 *)

Python

from math import isqrt
def A038484(n): return (1<<(a:=isqrt(n<<3)+1&-2)+(m:=a>>1))+(1<<3*(n-1-(m*(m-1)>>1))) # Chai Wah Wu, Apr 04 2025

Extensions

More terms from Vincenzo Librandi, Aug 06 2009

Offset corrected by Amiram Eldar, Jul 14 2022