A295821 Number of coprime pairs (a,b) with -n <= a <= n, -2 <= b <= 2.

2, 12, 16, 24, 28, 36, 40, 48, 52, 60, 64, 72, 76, 84, 88, 96, 100, 108, 112, 120, 124, 132, 136, 144, 148, 156, 160, 168, 172, 180, 184, 192, 196, 204, 208, 216, 220, 228, 232, 240, 244, 252, 256, 264, 268, 276, 280, 288, 292, 300, 304, 312, 316, 324, 328

Offset

0,1

Links

Table of n, a(n) for n=0..54.

Crossrefs

Column k=2 of A295782.

Cf. A137243.

Sequence in context: A114974 A298001 A071566 * A113802 A274890 A327570

Adjacent sequences: A295818 A295819 A295820 * A295822 A295823 A295824

Keyword

nonn

Author

Seiichi Manyama, Nov 28 2017

Status

approved