cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A239048 1 plus the n-th divisor of 24.

Original entry on oeis.org

2, 3, 4, 5, 7, 9, 13, 25
Offset: 1

Views

Author

Omar E. Pol, Mar 18 2014

Keywords

Comments

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.

References

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

Links

Crossrefs

Cf. A000521, A007240, A018253, A018623.
A subsequence of A238839.

Programs

Formula

a(n) = 1 + A018253(n).
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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