1,7
Eric Weisstein's World of Mathematics, Arf Invariant
Cf. A131434.
Sequence in context: A027228 A026950 A095052 this_sequence A110713 A098702 A100001
Adjacent sequences: A131430 A131431 A131432 this_sequence A131434 A131435 A131436
nonn,more
Eric Weisstein (eric(AT)weisstein.com), Jul 10, 2007
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