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39 lines
745 B
Plaintext
39 lines
745 B
Plaintext
NAME
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pix - number of primes not exceeding specified number
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SYNOPSIS
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pix(n [,err])
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TYPES
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n real
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err integer
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return nonnegative integer, or err
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DESCRIPTION
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If n is fractional or n >= 2^32, pix(n) causes an error,
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pix(n, err) returns the value of err.
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If n is an integer < 2^32, pix(n) returns the number of primes
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(2, 3, 5, ...) less or equal to n.
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EXAMPLE
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> for (i = 0; i <= 20; i++) print pix(i),:;
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0 0 1 2 2 3 3 4 4 4 4 5 5 6 6 6 6 7 7 8 8
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> print pix(100), pix(1000), pix(1e4), pix(1e5), pix(1e6)
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25 168 1229 9592 78498
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> print pix(2^32 - 1, -1), pix(2^32, -1)
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203280221 -1
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LIMITS
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none
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LIBRARY
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long zpix(ZVALUE z)
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FULL pix(FULL x)
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SEE ALSO
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XXX - fill in
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