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Intersection of A131857 and A131859: A131851(a(n))=1, A131852(a(n))=1.
Table of n, a(n) for n=1..54.
Cf. A131853, A131856, A131858.
Sequence in context: A195998 A174029 A103715 * A263578 A048080 A169598
Adjacent sequences: A131857 A131858 A131859 * A131861 A131862 A131863
Reinhard Zumkeller, Jul 22 2007