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A212815 a(n) = largest number k >= 7 such that A212813(k) = n. 6

%I

%S 8,12,54,258280326

%N a(n) = largest number k >= 7 such that A212813(k) = n.

%C Bellamy and Cadogan say that a(4) = 2*3^86093441, which is too large to include here.

%D Bellamy, O. S.; Cadogan, C. C. Subsets of positive integers: their cardinality and maximality properties. Proceedings of the Tenth Southeastern Conference on Combinatorics, Graph Theory and Computing (Florida Atlantic Univ., Boca Raton, Fla., 1979), pp. 167--178, Congress. Numer., XXIII-XXIV, Utilitas Math., Winnipeg, Man., 1979. MR0561043 (82b:10006)

%Y Cf. A036288, A212813, A212814, A212816, A212908, A212909.

%K nonn

%O 0,1

%A _N. J. A. Sloane_, May 30 2012

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Last modified October 15 22:25 EDT 2019. Contains 328038 sequences. (Running on oeis4.)