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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A257979 Smallest prime p for which exactly n primes k with k < p exist such that F_p-(p/k) == 0 (mod p), where F_i = A000045(i) and (a/b) denotes the Legendre symbol, or 0 if no such p exists. 1
2, 3, 11, 19, 13, 31, 47, 43, 37 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

Smallest p = prime(x) such that A257978(x) == n.

Conjecture: a(9) = 0 (based on observation of the asymptotic behavior of A257978).

a(10)-a(16) are 59, 71, 101, 97, 139, 127, 149.

LINKS

Table of n, a(n) for n=0..8.

PROG

(PARI) for(n=0, 10, forprime(p=2, , i=0; forprime(k=2, p, if(Mod(fibonacci(p-kronecker(p, k)), p)==0, i++)); if(i==n, print1(p, ", "); break({1}))))

CROSSREFS

Cf. A257978.

Sequence in context: A024861 A025101 A025105 * A095984 A229550 A172258

Adjacent sequences:  A257976 A257977 A257978 * A257980 A257981 A257982

KEYWORD

nonn,more

AUTHOR

Felix Fröhlich, May 15 2015

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 15 07:50 EDT 2019. Contains 328026 sequences. (Running on oeis4.)