0,2
a(n)=PrimePi[A002981(n)!+1]
exact subscript of 5th prime [1+27!=10888869450418352160768000001] not yet available
A002981, A002982, A055490.
Sequence in context: A006263 A079236 A138852 this_sequence A020821 A020773 A100085
Adjacent sequences: A062698 A062699 A062700 this_sequence A062702 A062703 A062704
hard,nonn
Labos E. (labos(AT)ana.sote.hu), Jul 11 2001
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