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!)
A165697 a(n) is the smallest prime p such that all the n numbers reversal(p^k), k<n+1 are primes. 2
2, 37, 3121, 10429, 10282339, 9835884797, 101740496633 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

By an interesting approach I was able to find a(7). [From Farideh Firoozbakht, Sep 30 2009]

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Both numbers reversal(37)=73 & reversal(37^2)=9631 are primes and 37 is the

smallest prime number with this property so a(2)=37.

CROSSREFS

Cf. A118212, A118213, A165696, A165698.

Sequence in context: A257995 A234971 A139108 * A320994 A083189 A145798

Adjacent sequences:  A165694 A165695 A165696 * A165698 A165699 A165700

KEYWORD

base,hard,more,nonn

AUTHOR

Farideh Firoozbakht, Sep 29 2009

EXTENSIONS

a(7) from Farideh Firoozbakht, Sep 30 2009

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 12 10:52 EDT 2021. Contains 342920 sequences. (Running on oeis4.)