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A091099
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Number of primes of the form 4k+3 less than 10^n.
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10
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2, 13, 87, 619, 4808, 39322, 332398, 2880950, 25424042, 227529235, 2059034532, 18803987677, 173032827655, 1602470967129, 14922285687184, 139619172246129, 1311778581969146, 12369977145161275, 117028833678543917, 1110409801410336132
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OFFSET
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1,1
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LINKS
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Table of n, a(n) for n=1..20.
Marc Deleglise, Pierre Dusart, and Xavier-Francois Roblot, Counting primes in residue classes, Math. Comp. 73 (2004), no. 247, 1565-1575
Daniel Pareja, Prime Number Races
Eric Weisstein's World of Mathematics, Modular Prime Counting Function
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MATHEMATICA
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cnt=0; k=0; Table[lim=10^n; While[4k+3<lim, If[ PrimeQ[4k+3], cnt++ ]; k++ ]; cnt, {n, 6}]
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CROSSREFS
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Cf. A091098 (number of primes of the form 4k+1 less than 10^n).
Sequence in context: A162275 A092070 A091116 * A092849 A300429 A106938
Adjacent sequences: A091096 A091097 A091098 * A091100 A091101 A091102
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KEYWORD
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nonn
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AUTHOR
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T. D. Noe, Dec 19 2003
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EXTENSIONS
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a(10)-a(16) from Robert G. Wilson v, Dec 22 2003
a(17)-a(20) from Marc Deleglise, Jun 28 2007
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STATUS
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approved
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