A305705 Positive integers which are not the semiperimeter of any triangle with integer sides and area.

1, 2, 3, 4, 5, 7, 10, 11, 13, 14, 17, 19, 23, 26, 29, 31, 37, 41, 43, 46, 47, 51, 53, 58, 59, 61, 62, 67, 69, 71, 73, 74, 79, 83, 89, 92, 94, 97, 101, 103, 106, 107, 109, 113, 122, 123, 127, 131, 137, 139, 141, 142, 149, 151, 157, 158, 163, 167, 173, 179, 181

Offset

1,2

Links

Peter Kagey, Table of n, a(n) for n = 1..1000

Formula

a(n) = A305703(n)/2.

Crossrefs

Complement of A305704.

Cf. A051518, A305703.

Sequence in context: A285276 A002504 A133431 * A123091 A191918 A191925

Adjacent sequences: A305702 A305703 A305704 * A305706 A305707 A305708

Keyword

nonn

Author

Peter Kagey, Jun 08 2018

Status

approved