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A305378
Tribonacci representation of 2n+1, written in base 10.
1
1, 3, 5, 8, 10, 12, 16, 18, 20, 22, 25, 27, 33, 35, 37, 40, 42, 44, 48, 50, 52, 54, 65, 67, 69, 72, 74, 76, 80, 82, 84, 86, 89, 91, 97, 99, 101, 104, 106, 108, 128, 130, 132, 134, 137, 139, 141, 145, 147, 149, 152, 154, 160, 162, 164, 166, 169, 171, 173, 177, 179, 181, 192, 194, 196, 198, 201
OFFSET
0,2
LINKS
MAPLE
L[0]:= [0]: L[1]:= [1]:
for d from 2 to 10 do
L[d]:= map(t -> (2*t, `if`(t mod 4 <> 3, 2*t+1, NULL)), L[d-1])
od:
A003726:=map(op, [seq(L[i], i=0..10)]):
seq(A003726[i], i=2..nops(A003726), 2); # Robert Israel, Jun 12 2018
PROG
(Python)
def A305378(n):
m, tlist, s = 2*n+1, [1, 2, 4], 0
while tlist[-1]+tlist[-2]+tlist[-3] <= m:
tlist.append(tlist[-1]+tlist[-2]+tlist[-3])
for d in tlist[::-1]:
s *= 2
if d <= m:
s += 1
m -= d
return s # Chai Wah Wu, Jun 12 2018
CROSSREFS
Equals A003726(2n+1).
Cf. A278038.
Sequence in context: A195170 A079527 A287236 * A362935 A033033 A211704
KEYWORD
nonn,base
AUTHOR
N. J. A. Sloane, Jun 12 2018
EXTENSIONS
More terms from Robert Israel, Jun 12 2018
STATUS
approved