C. S. Davis - cp's OEIS frontend

User: C. S. Davis

C. S. Davis has authored 2 sequences.

A383785 Numbers not occurring as norms of vectors in any regular planar lattice.

6, 11, 14, 15, 22, 23, 24, 30, 33, 35, 38, 42, 44, 46, 47, 51, 54, 55, 56, 59, 60, 62, 66, 69, 70, 71, 77, 78, 83, 86, 87, 88, 92, 94, 95, 96, 99, 102, 105, 107, 110, 114, 115, 118, 119, 120, 123, 126, 131, 132, 134, 135, 138, 140, 141, 142, 143, 150, 152, 154

Offset: 1

C. S. Davis, May 09 2025

nonn

The norms of Hurwitz quaternions strictly noncoplanar with the origin and any nonopposing pair of unit Hurwitz quaternions, due to Lagrange's four-square theorem and the complement's representation of every coplanar Hurwitz quaternion norm. - C. S. Davis, May 19 2025

C. S. Davis, Table of n, a(n) for n = 1..7374

Intersection of A022544 and A034020.
Complement of A383784.
Supersequence of A055039.

A383784 Norms of vectors in any regular planar tiling (square or A2 lattice).

Original entry on oeis.org

0, 1, 2, 3, 4, 5, 7, 8, 9, 10, 12, 13, 16, 17, 18, 19, 20, 21, 25, 26, 27, 28, 29, 31, 32, 34, 36, 37, 39, 40, 41, 43, 45, 48, 49, 50, 52, 53, 57, 58, 61, 63, 64, 65, 67, 68, 72, 73, 74, 75, 76, 79, 80, 81, 82, 84, 85, 89, 90, 91, 93, 97, 98, 100, 101, 103, 104

Offset: 1

C. S. Davis, May 09 2025

nonn

C. S. Davis, Table of n, a(n) for n = 1..17641

Union of A001481 and A003136.
Complement of A383785.
Subsequence of A000401.

cp's OEIS Frontend

User: C. S. Davis

A383785 Numbers not occurring as norms of vectors in any regular planar lattice.

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