A038479 -id:A038479 - cp's OEIS frontend

A038478 Sums of 2 distinct powers of 6.

7, 37, 42, 217, 222, 252, 1297, 1302, 1332, 1512, 7777, 7782, 7812, 7992, 9072, 46657, 46662, 46692, 46872, 47952, 54432, 279937, 279942, 279972, 280152, 281232, 287712, 326592, 1679617, 1679622, 1679652, 1679832, 1680912, 1687392, 1726272, 1959552, 10077697, 10077702

Offset: 1

Olivier Gérard

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

Base-6 interpretation of A038444.

Cf. A000400, A038479, A038480.

Total/@Subsets[6^Range[0,10],{2}]//Union (* Harvey P. Dale, Aug 11 2018 *)

from math import isqrt
def A038478(n): return 6**(m:=isqrt(n<<3)+1>>1)+6**(n-1-(m*(m-1)>>1)) # Chai Wah Wu, Apr 04 2025

Offset corrected by Amiram Eldar, Jul 14 2022

A038480 Sums of 4 distinct powers of 6.

Original entry on oeis.org

259, 1339, 1519, 1549, 1554, 7819, 7999, 8029, 8034, 9079, 9109, 9114, 9289, 9294, 9324, 46699, 46879, 46909, 46914, 47959, 47989, 47994, 48169, 48174, 48204, 54439, 54469, 54474, 54649, 54654, 54684, 55729, 55734, 55764, 55944, 279979, 280159, 280189, 280194

Offset: 1

Olivier Gérard

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

Base-6 interpretation of A038446.

Cf. A000400, A038478, A038479.

Union[Total/@Subsets[6^Range[0,10],{4}]] (* Harvey P. Dale, Nov 05 2011 *)

Offset corrected by Amiram Eldar, Jul 14 2022

cp's OEIS Frontend

A038478 Sums of 2 distinct powers of 6.

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