A330313 Add the odd terms and subtract the even ones, the result must always be a palindrome in base 3. This is the lexicographically earliest sequence of distinct positive integers with this property.

1, 3, 2, 11, 7, 4, 6, 8, 21, 5, 12, 14, 89, 9, 18, 26, 16, 20, 10, 13, 17, 24, 75, 39, 30, 32, 23, 51, 31, 22, 43, 34, 48, 44, 28, 36, 19, 29, 42, 81, 68, 33, 35, 69, 60, 72, 63, 73, 52, 56, 40, 105, 61, 70, 84, 93, 91, 82, 50, 41, 98, 45, 53, 103, 64, 78, 54, 123, 128, 57, 71, 129

Offset

1,2

Comments

A base 3 analog of A329544. The latter has an exceptionally irregular graph, so it is natural to ask if the graph is more understandable in a smaller base (and base 2 does not work).

Links

Rémy Sigrist, Table of n, a(n) for n = 1..50000 (first 1000 terms from N. J. A. Sloane)

Rémy Sigrist, Density plot of the first 5000000 terms

Rémy Sigrist, C++ program for A330313

N. J. A. Sloane, Table of n, a(n), A330314(n), A330314(n)/a(n) for n = 1..1000

Prog

(C++) See Links section.

Crossrefs

Cf. A014190, A329544, A330312, A330314 (running totals).

Sequence in context: A065014 A013945 A072656 * A191669 A344891 A163841

Adjacent sequences: A330310 A330311 A330312 * A330314 A330315 A330316

Keyword

nonn,look,base

Author

N. J. A. Sloane, Dec 11 2019

Status

approved