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.

Showing 1-2 of 2 results.

A199014 Divisors of 196884.

Original entry on oeis.org

1, 2, 3, 4, 6, 9, 12, 18, 27, 36, 54, 108, 1823, 3646, 5469, 7292, 10938, 16407, 21876, 32814, 49221, 65628, 98442, 196884
Offset: 1

Views

Author

Omar E. Pol, Nov 03 2011

Keywords

Comments

196884 =2^2*3^3*1823 is the third coefficient of modular function j (see A000521). 196884 has 24 divisors. Its first 12 divisors are the divisors of 108 =2^2*3^3 (see A018287).

Links

Crossrefs

Cf. A000521, A001379, A018253, A018287, A018623, A174670, A174671.

Programs

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).
Showing 1-2 of 2 results.

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