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A305705 Positive integers which are not the semiperimeter of any triangle with integer sides and area. 1
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 20 23:04 EDT 2021. Contains 347596 sequences. (Running on oeis4.)