2,4
Eric Weisstein's World of Mathematics, Znam's Problem
Cf. A075461.
Sequence in context: A133645 A090140 A032267 this_sequence A111790 A127580 A098048
Adjacent sequences: A075438 A075439 A075440 this_sequence A075442 A075443 A075444
nonn,more,hard
Eric Weisstein (eric(AT)weisstein.com), Sep 16, 2002
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