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 1-4 of 4 results.

A119642 Indices of prime numbers of trees with n unlabeled nodes.

Original entry on oeis.org

4, 5, 7, 8, 9, 13, 15, 52, 82, 134, 216, 341, 538, 1414, 17306, 17582
Offset: 1

Views

Author

Jorge Coveiro, Jul 27 2006

Keywords

Comments

No other terms below 40000. - Vaclav Kotesovec, Jul 08 2020

Crossrefs

Cf. A000055, A051420, A119641, A336042.

Formula

A000055(a(n)) = A119641(n). - Amiram Eldar, Apr 22 2018

Extensions

Offset changed by Michel Marcus, Apr 22 2018
a(13)-a(16) from Amiram Eldar, Apr 22 2018

A185667 Primes in A000081.

Original entry on oeis.org

2, 719, 87811
Offset: 1

Views

Author

Jonathan Vos Post, Feb 08 2011

Keywords

Comments

A000081(n) is prime for n in A051420.
a(4) = A000081(343) has 158 digits and is too large to be displayed here.

Links

Crossrefs

Cf. A000040, A000081, A005200, A051420, A119641, A119642.

Formula

A000040 INTERSECTION A000081.
a(n) = A000081(A051420(n)). - Amiram Eldar, Nov 11 2017

A336039 Numbers k such that A000081(k) is divisible by k.

Original entry on oeis.org

1, 4, 24, 72, 121, 475, 8744, 19933, 38357, 41685
Offset: 1

Views

Author

Vaclav Kotesovec, Jul 07 2020

Keywords

Comments

No other terms below 100000. - Mathieu Gouttenoire, Nov 01 2021

Examples

			24 is in the sequence because A000081(24) = 24 * 30988541.
72 is in the sequence because A000081(72) = 72 * 77434098197798038469129694128.

Crossrefs

Cf. A000081, A051420, A336042.

Extensions

a(10) from Mathieu Gouttenoire, Nov 01 2021

A336042 Numbers k such that A000055(k) is divisible by k.

Original entry on oeis.org

1, 6, 90, 1031, 1099
Offset: 1

Views

Author

Vaclav Kotesovec, Jul 08 2020

Keywords

Comments

No other terms below 40000.

Examples

			90 is in the sequence because A000055(90) = 90*179212383627255715871103677440244414

Crossrefs

Cf. A000055, A051420, A119642, A336039.
Showing 1-4 of 4 results.

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

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