OFFSET
0,1
LINKS
T. D. Noe, Rows n = 0..100 of triangle, flattened
FORMULA
MATHEMATICA
Union[Total/@Tuples[8^Range[0, 10], {2}]] (* Harvey P. Dale, Mar 13 2011 *)
PROG
(Python)
def valuation(n, b):
v = 0
while n > 1: n //= b; v += 1
return v
def aupto(lim):
pows8 = [8**i for i in range(valuation(lim-1, 8) + 1)]
sum_pows8 = sorted([a+b for i, a in enumerate(pows8) for b in pows8[i:]])
return [s for s in sum_pows8 if s <= lim]
print(aupto(16777217)) # Michael S. Branicky, Feb 09 2021
(Python)
from math import isqrt
def A055259(n): return (1<<3*(a:=(k:=isqrt(m:=(n+1)<<1))+(m>k*(k+1))-1))+(1<<3*(n-(a*(a+1)>>1))) # Chai Wah Wu, Apr 08 2025
CROSSREFS
KEYWORD
AUTHOR
Henry Bottomley, Jun 22 2000
STATUS
approved
