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A220450 A220449(n) mod 19. 2
1, 1, 9, 10, 0, 11, 11, 2, 6, 12, 15, 9, 0, 17, 15, 4, 1, 17, 2, 17, 17, 1, 18, 0, 16, 16, 15, 7, 14, 8, 1, 0, 4, 8, 11, 17, 4, 15, 4, 4, 17, 2, 0, 6, 6, 8, 5, 10, 3, 17, 0, 11, 3, 16, 4, 11, 8, 11, 11, 4, 15, 0, 7, 7, 3, 9, 18, 13, 4, 0, 16, 13, 6, 11, 16, 3, 16, 16, 11, 8, 0, 5, 5, 13, 1, 2, 12 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..87.

V. H. Moll, An arithmetic conjecture on a sequence of arctangent sums, 2012.

CROSSREFS

Cf. A220449.

Sequence in context: A226050 A058200 A067450 * A318147 A324663 A109409

Adjacent sequences:  A220447 A220448 A220449 * A220451 A220452 A220453

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Dec 22 2012

STATUS

approved

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Last modified August 19 05:01 EDT 2019. Contains 326109 sequences. (Running on oeis4.)