1,1
If prime(n=6)=13 and prime(prime(6))=41, then 1<4=even and 13=a(1). If prime(n=8)=23 and prime(prime(8))=83, then even=8>3 and 23=a(2). If prime(n=16)=53 and prime(prime(16))=241, then 2<4=even>1 and 53=a(3). etc.
Cf. A000040.
Sequence in context: A068712 A103166 A154863 this_sequence A139863 A046862 A155093
Adjacent sequences: A155046 A155047 A155048 this_sequence A155050 A155051 A155052
nonn,base
Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Jan 19 2009
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