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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 Table of n, a(n) for n=1..27. D. K. Ray-Chaudhuri and Richard M. Wilson, Solution of Kirkman's schoolgirl problem, in Proceedings of Symposia in Pure Mathematics, Volume 19, 1971. Wikipedia, Kirkman's schoolgirl problem CROSSREFS Cf. A318240. Sequence in context: A090589 A163400 A090972 * A181742 A179843 A319198 Adjacent sequences: A318238 A318239 A318240 * A318242 A318243 A318244 KEYWORD nonn,more AUTHOR Floris P. van Doorn, Aug 25 2018 STATUS approved

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Last modified August 13 20:30 EDT 2024. Contains 375144 sequences. (Running on oeis4.)