login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A244065 Pseudoprimes to base 3 that are not squarefree. 8
121, 3751, 4961, 7381, 11011, 29161, 32791, 142901, 228811, 239701, 341341, 551881, 566401, 595441, 671671, 784201, 856801, 1016521, 1237951, 1335961, 1433971, 1804231 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Must be divisible by the square of a Mirimanoff prime, A014127. - Charles R Greathouse IV, Jun 21 2014

LINKS

Felix Fröhlich and Charles R Greathouse IV, Table of n, a(n) for n = 1..10000 (first 196 terms from Fröhlich)

PROG

(PARI) for(n=2, 10^9, if(!isprime(n) && Mod(3, n)^(n-1)==1 && !issquarefree(n), print1(n, ", ")))

(PARI) list(lim)=my(M=[11, 1006003], v=List(), p2); for(i=1, #M, p2=M[i]^2; forstep(n=p2, lim, p2, if(Mod(3, n)^(n-1)==1, listput(v, n)))); Set(v) \\ Good for lim <= 9.4 * 10^29; Charles R Greathouse IV, Jun 21 2014

CROSSREFS

Cf. A005935, A158358, A014127.

Sequence in context: A206629 A014758 A069600 * A231649 A212802 A272775

Adjacent sequences:  A244062 A244063 A244064 * A244066 A244067 A244068

KEYWORD

nonn

AUTHOR

Felix Fröhlich, Jun 19 2014

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 October 22 22:34 EDT 2019. Contains 328335 sequences. (Running on oeis4.)