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!)
A062214 Numbers k such that the smoothly undulating palindromic number(18*10^k - 81)/99 is a prime. 0
3, 5, 77, 163, 1479, 3657, 4573, 8315, 30259, 31063, 31855, 36915, 66657 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Prime versus probable prime status and proofs are given in the author's table.

No further terms < 100000. - Ray Chandler, Aug 17 2011

LINKS

Table of n, a(n) for n=1..13.

P. De Geest, SUPP Reference Table - 181

Index entries for sequences related to smoothly undulating palindromic primes

EXAMPLE

k=5 -> (18*10^5 - 81)/99 = 18181.

CROSSREFS

Cf. A062209-A062232, A059758, A032758.

Sequence in context: A145616 A306255 A122912 * A323490 A144617 A301492

Adjacent sequences:  A062211 A062212 A062213 * A062215 A062216 A062217

KEYWORD

nonn,base

AUTHOR

Patrick De Geest and Hans Rosenthal (Hans.Rosenthal(AT)t-online.de), Jun 15 2001

EXTENSIONS

a(13)=66657 from Ray Chandler, Jan 31 2011

Edited by Ray Chandler, Aug 17 2011

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 June 13 18:45 EDT 2021. Contains 345008 sequences. (Running on oeis4.)