2,1
C. Clawson, Mathematical Mysteries, Plenum Press, 1996, p. 158.
a(n)=li(n)-pi(n)
Cf. A057752.
Sequence in context: A015338 A131750 A068749 this_sequence A033406 A143759 A020665
Adjacent sequences: A045913 A045914 A045915 this_sequence A045917 A045918 A045919
easy,nonn
Felice Russo (felice.russo(AT)katamail.com)
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