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A239048 1 plus the n-th divisor of 24. 1


%S 2,3,4,5,7,9,13,25

%N 1 plus the n-th divisor of 24.

%C Also Coxeter number (denoted m(X)) of the Niemeier lattices X whose root systems are of pure A-type according to the ADE classification; see Ono-Rolen-Trebat paper, page 3, Table 1, Pure A-type root systems.

%D J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, 3rd. ed., 1993. Table 16.1, p. 407.

%H Ken Ono, Larry Rolen, Sarah Trebat-Leder, <a href="http://arxiv.org/abs/1403.3712">Classical and umbral Moonshine: connections and p-adic properties</a>, arXiv:1403.7312v1 [math.NT]

%F a(n) = 1 + A018253(n).

%Y Cf. A000521, A007240, A018253, A018623.

%Y A subsequence of A238839.

%K nonn,easy,fini,full

%O 1,1

%A _Omar E. Pol_, Mar 18 2014

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Last modified November 29 01:03 EST 2020. Contains 338755 sequences. (Running on oeis4.)