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Intersection of A131854 and A131857: A131851(a(n))=0, A131852(a(n))=1.
Table of n, a(n) for n=1..55.
Cf. A131853, A131858, A131860.
Sequence in context: A175871 A137107 A174236 * A007344 A153536 A153564
Adjacent sequences: A131853 A131854 A131855 * A131857 A131858 A131859
Reinhard Zumkeller, Jul 22 2007