|
|
A226470
|
|
a(n) = n^2 XOR triangular(n), where XOR is the bitwise logical exclusive-or operator.
|
|
2
|
|
|
0, 0, 7, 15, 26, 22, 49, 45, 100, 124, 83, 59, 222, 242, 173, 153, 392, 440, 495, 471, 322, 350, 281, 773, 876, 820, 1019, 931, 646, 762, 597, 561, 1552, 1648, 1751, 1727, 1930, 2022, 1857, 1789, 1396, 1484, 1379, 1163, 1102, 994, 3197, 3273, 3480, 3496, 3391, 3847, 4082
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,3
|
|
LINKS
|
|
|
FORMULA
|
|
|
EXAMPLE
|
a(2) = 2^2 xor 2*3/2 = 4 xor 3 = 7.
|
|
MATHEMATICA
|
Table[BitXor[n^2, (n(n+1))/2], {n, 0, 60}] (* Harvey P. Dale, Aug 11 2017 *)
|
|
PROG
|
(Python)
for n in range(99):
print((n*n) ^ (n*(n+1)//2), end=", ")
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,base
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|