login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A062589 Numbers n such that 23^n - 22^n is prime, or a strong pseudoprime. 3
229, 241, 673, 5387, 47581 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Terms greater than 1000 often correspond to "unproven" strong pseudoprimes.

a(6) > 10^5. - Robert Price, Aug 22 2012

LINKS

Table of n, a(n) for n=1..5.

CROSSREFS

Cf. A000043, A057468, A059801, A059802, A062572-A062588, A214658, A214655, A062592-A062666.

Sequence in context: A061783 A140017 A119711 * A250235 A250236 A094612

Adjacent sequences:  A062586 A062587 A062588 * A062590 A062591 A062592

KEYWORD

nonn,hard

AUTHOR

Mike Oakes, May 18 2001, May 19 2001

EXTENSIONS

a(5) from Robert Price, Aug 22 2012

Edited by M. F. Hasler, Sep 21 2013

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 10 02:39 EDT 2020. Contains 333392 sequences. (Running on oeis4.)