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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A278581 Numbers n such that the Shimura subgroup Sigma(n) of the Jacobi variety J_0(n) has order 1.

Original entry on oeis.org

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 16, 18, 25, 36, 49, 50, 169
Offset: 1

Views

Author

N. J. A. Sloane, Nov 30 2016

Keywords

References

  • Ling, S., and J. Oesterlé. "The Shimura subgroup of J_0(N)." Astérisque, Vol. 196-197 (1991), 171-203.

Crossrefs

Cf. A278582, A091401.

A243709 Coxeter numbers of the D-type Niemeier root systems.

Original entry on oeis.org

6, 10, 14, 18, 22, 30, 46
Offset: 1

Views

Author

N. J. A. Sloane, Jun 19 2014

Keywords

Comments

These are exactly the even integers 2n such that the group Gamma_0(2n)+n has genus zero.

Links

Crossrefs

Cf. A091401.

Formula

a(n) = 2*A133848(n+11). - Omar E. Pol, Dec 20 2014
Previous Showing 21-22 of 22 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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