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.

A051420 Numbers k such that A000081(k) is prime.

Original entry on oeis.org

3, 10, 15, 343, 387, 1087, 2981, 96761
Offset: 1

Views

Author

David Broadhurst

Keywords

Comments

A000081(2981) = O(10^1400) is only a probably prime. No more terms < 6000.
No more terms < 40000. - Vaclav Kotesovec, Jul 07 2020
A000081(96761) is a probable prime. No other terms < 100000. - Mathieu Gouttenoire, Oct 08 2021

Crossrefs

Cf. A000081, A119642, A185667, A336039.

Extensions

a(8) from Mathieu Gouttenoire, Oct 08 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 1-2 of 2 results.

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

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