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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A242866 Union of 2*A019434 and the semiprimes in A000215.

Original entry on oeis.org

6, 10, 34, 514, 131074, 4294967297, 18446744073709551617, 340282366920938463463374607431768211457, 115792089237316195423570985008687907853269984665640564039457584007913129639937
Offset: 1

Views

Author

Juri-Stepan Gerasimov, May 24 2014

Keywords

Comments

The old definition was "Semiprimes of the form 2^(2^k) + 1 or 2^(2^k) + 2 for some k >= 0", but that does not include 10. So I replaced the old definition with the old comment, which seems a better fit. Question: is the sequence defined by the old definition in the OEIS? If not it should be added. - N. J. A. Sloane, Sep 03 2023

Links

Crossrefs

Cf. A000215, A019434, A242832.

Extensions

Definition edited by N. J. A. Sloane, Sep 02 2023
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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