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URL: https://oeis.org/A038464

⇱ A038464 - OEIS


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A038464
Sums of 2 distinct powers of 3.
12
4, 10, 12, 28, 30, 36, 82, 84, 90, 108, 244, 246, 252, 270, 324, 730, 732, 738, 756, 810, 972, 2188, 2190, 2196, 2214, 2268, 2430, 2916, 6562, 6564, 6570, 6588, 6642, 6804, 7290, 8748, 19684, 19686, 19692, 19710, 19764, 19926, 20412, 21870, 26244, 59050, 59052
OFFSET
1,1
LINKS
MATHEMATICA
Sort[Plus @@@ Subsets[3^Range[0, 10], {2}]] (* Amiram Eldar, Jul 13 2022 *)
PROG
(Python)
from math import isqrt
def A038464(n): return 3**(m:=isqrt(n<<3)+1>>1)+3**(n-1-(m*(m-1)>>1)) # Chai Wah Wu, Apr 05 2025
CROSSREFS
Base-3 interpretation of A038444.
Sequence in context: A390944 A354024 A074939 * A366633 A360037 A125966
KEYWORD
nonn,easy
EXTENSIONS
Offset corrected by Amiram Eldar, Jul 13 2022
STATUS
approved