37916

Appears in sequences

• Group the triangular numbers so that the n-th group sum is a multiple of n. 1, (3, 6, 10, 15), (21), (28), (36, 45, 55, 66, 78), (91, 105, 120, 136, 153, 171, 190), ... Sequence contains n-th group sum divided by n.at n=40A114032
• Number of 2-overlap bipartite perfect graphs on n nodes.at n=9A123468
• Fundamental discriminants d uniquely characterizing all complex biquadratic fields Q(sqrt(-3),sqrt(d)) which have 3-class group of type (3,3) and second 3-class group isomorphic to SmallGroup(729,34).at n=20A250241
• Invert transform of A037952.at n=12A348012
• The five digits of a(n) and their four successive absolute first differences are all distinct.at n=18A365257