A372098 a(n) = A070939(3^k) - 2*A000120(3^k) with k = A372097(n).

-1, 0, 1, 2, 4, 7, 8, 12, 15, 18, 25, 26, 30, 51, 75, 78, 84, 129, 133, 148, 170, 180, 183, 189, 209, 265, 279, 285, 287, 336, 369, 388, 406, 412, 445, 469, 496, 581, 711, 737, 741, 742, 873, 939, 994, 1044, 1078, 1111, 1157, 1158, 1492, 1636, 1767, 1914, 1933

Offset: 1

Author

Hugo Pfoertner, Apr 25 2024

Keywords

• sign

Comments

a(n)/2 are the negated differences at supporting points of the lower envelope of the scatter band of the deviation of the binary weight of 3^k from half the length of the corresponding binary number.

Links

• Hugo Pfoertner, Table of n, a(n) for n = 1..99

Crossrefs

Cf. A000120, A000244, A011754, A070939, A078839, A372097, A372099, A372100.