1,1
A164023(a(n)) = A164024(a(n)) = A000040(n). [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Aug 09 2009]
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Prime[Range[22]]*3 - Vladimir Orlovsky (4vladimir(AT)gmail.com), Apr 29 2008
Sequence in context: A020648 A020147 A164383 this_sequence A097426 A075278 A102971
Adjacent sequences: A001745 A001746 A001747 this_sequence A001749 A001750 A001751
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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