cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A115847 Integers i such that 17*i = 17 X i, i.e., 16*i XOR i = 17*i.

Original entry on oeis.org

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 20, 22, 24, 26, 28, 30, 32, 33, 36, 37, 40, 41, 44, 45, 48, 52, 56, 60, 64, 65, 66, 67, 72, 73, 74, 75, 80, 82, 88, 90, 96, 97, 104, 105, 112, 120, 128, 129, 130, 131, 132, 133, 134, 135, 144, 146, 148, 150
Offset: 0

Views

Author

Antti Karttunen, Feb 01 2006

Keywords

Comments

Here * stands for ordinary multiplication and X means carryless (GF(2)[X]) multiplication (A048720).
A116361(a(n)) <= 4. - Reinhard Zumkeller, Feb 04 2006

Links

Crossrefs

Cf. A115848 shows this sequence in binary. Complement of A115849. Differs from A032966 for the first time at n=25, where A032966(25)=34 while a(25)=33.
Cf. A003714, A048716, A115845, A116360.

Programs

A033067 Numbers whose base-16 representation Sum_{i=0..m} d(i)*16^i has odd d(m-i) for all odd i.

Original entry on oeis.org

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99, 101, 103, 105, 107, 109, 111, 113, 115
Offset: 1

Views

Author

Clark Kimberling

Keywords

Crossrefs

Disjoint with A032966 if more than 1 digit.

Programs

  • Maple
    q:= n-> (l-> andmap(x-> x::odd, [seq(l[-i], i=2..nops(l), 2)]))(convert(n, base, 16)):
select(q, [$1..115])[];  # Alois P. Heinz, Jul 22 2025

Extensions

Definition corrected by R. J. Mathar and Alois P. Heinz, Jul 22 2025
Showing 1-2 of 2 results.

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