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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A320757 For p the n-th prime congruent to 1 (mod 4), a(n) is the clique number of the quadratic residue (Paley) graph over F_p, the field of order p. 1
 2, 3, 3, 4, 4, 5, 5, 5, 5, 5, 6, 5, 6, 7, 7, 7, 7, 8, 7, 7, 8, 9, 7, 7, 7, 8, 8, 7, 8, 8, 9, 9, 9, 9, 8, 9, 9, 9, 9, 9, 11, 9, 11, 11, 9, 9, 11, 11, 9, 10, 11, 11, 12, 11, 11, 11, 11, 11, 11, 10, 10, 11 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Eric Weisstein's World of Mathematics, Clique Number Eric Weisstein's World of Mathematics, Paley Graph EXAMPLE a(1) = 2, since the Paley graph of order 5 is a 5-cycle, and contains no triangle. CROSSREFS Cf. A002144 (primes of form 4n + 1), A320837. Sequence in context: A336515 A130500 A072073 * A061716 A341053 A126236 Adjacent sequences:  A320754 A320755 A320756 * A320758 A320759 A320760 KEYWORD nonn,more AUTHOR Jeremy F. Alm, Oct 20 2018 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.

Last modified June 17 17:33 EDT 2021. Contains 345085 sequences. (Running on oeis4.)