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A320837
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For p the n-th prime congruent to 1 (mod 4), a(n) is the clique number of the subgraph of the quadratic residue (Paley) graph over F_p, the field of order p, that is induced by the set of vertices that are themselves quadratic residues.
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1
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1, 2, 2, 3, 3, 4, 4, 4, 4, 4, 5, 4, 5, 6, 6, 6, 6, 7, 6, 6, 7, 8, 6, 6, 6, 7, 7, 6, 7, 7, 8, 8, 8, 8, 7, 8, 8, 8, 8, 8, 10, 8, 10, 10, 8, 8, 10, 10, 8, 9, 10, 10, 11, 10, 10, 10, 10, 10, 10, 9, 9, 10, 10, 10, 10, 10, 8, 10, 11, 10, 12, 12, 12, 10
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OFFSET
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1,2
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LINKS
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EXAMPLE
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a(1) = 1 because the subgraph of the Paley graph of order 5 induced by {1,4} is the two-vertex empty graph.
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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STATUS
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approved
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