A003833 Sectors around outside of dartboard.

20, 1, 18, 4, 13, 6, 10, 15, 2, 17, 3, 19, 7, 16, 8, 11, 14, 9, 12, 5, 20, 1, 18, 4, 13, 6, 10, 15, 2, 17, 3, 19, 7, 16, 8, 11, 14, 9, 12, 5, 20, 1, 18, 4, 13, 6, 10, 15, 2, 17, 3, 19, 7, 16, 8, 11, 14, 9, 12, 5, 20, 1, 18, 4, 13, 6, 10, 15, 2, 17, 3, 19, 7, 16, 8, 11, 14, 9

Offset

1,1

Comments

Known as the standard, London or clock dartboard.

Periodic with period 20. - Paolo Xausa, Jul 14 2025

References

Marilyn vos Savant, "Ask Marilyn," in 'Parade, The Sunday Newspaper Magazine,' page 12, Sunday, Jan 12, 2003.

Links

Paolo Xausa, Table of n, a(n) for n = 1..10000

K. S. Brown, The Dartboard Sequence

American Darts Organization, Home page

World Darts Federation, WDF Playing and Tournament Rules

Index entries for linear recurrences with constant coefficients, signature (0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1).

Mathematica

PadRight[{}, 100, {20, 1, 18, 4, 13, 6, 10, 15, 2, 17, 3, 19, 7, 16, 8, 11, 14, 9, 12, 5}] (* Paolo Xausa, Jul 14 2025 *)

Crossrefs

Cf. A008575, A104159.

Sequence in context: A347691 A040417 A278414 * A040418 A140116 A084923

Adjacent sequences: A003830 A003831 A003832 * A003834 A003835 A003836

Keyword

nonn,easy

Author

N. J. A. Sloane

Status

approved