1,1

By definition, the diameter of a regular k-gon is the length of its longest diagonal.

Table of n, a(n) for n=1..12.

This ratio for a regular 7-gon (heptagon) is 3.115293... (A280533), where 3.1 equals the first two digits of Pi's decimal expansion. Because the first two digits are not 3.1 for k < 7, a(2) = 7.

Cf. A000796, A280533.

Sequence in context: A018776 A104683 A153121 * A070153 A293943 A171619

Adjacent sequences: A280923 A280924 A280925 * A280927 A280928 A280929

nonn,base,more

Rick L. Shepherd, Jan 10 2017

approved