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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

Table of n, a(n) for n=1..62.

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

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