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A318241 Column 3 of array in A318240. 1
0, 1, 1, 3, 3, 4, 4, 4, 4, 6, 6, 6, 7, 7, 7, 9, 9, 9, 10, 10, 10, 12, 12, 12, 13, 13, 13 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,4
COMMENTS
The next value a(28) is either 15 or 16.
a(6k+1) = a(6k+2) = a(6k+3) = 3k+1 for k >= 1. This follows from the solution to Kirkman's schoolgirl problem with n schoolgirls.
The values of a(6k), a(6k-1) and a(6k-2) are either 3k or 3k+1.
LINKS
D. K. Ray-Chaudhuri and Richard M. Wilson, Solution of Kirkman's schoolgirl problem, in Proceedings of Symposia in Pure Mathematics, Volume 19, 1971.
CROSSREFS
Cf. A318240.
Sequence in context: A090589 A163400 A090972 * A181742 A179843 A319198
KEYWORD
nonn,more
AUTHOR
Floris P. van Doorn, Aug 25 2018
STATUS
approved

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Last modified March 19 02:58 EDT 2024. Contains 370952 sequences. (Running on oeis4.)