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Search: id:A073510
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| A073510 |
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Number of primes less than 10^n with initial digit 8. |
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+0
1
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| 0, 2, 17, 127, 1003, 8326, 71038, 618610, 5481646, 49221187, 446590932, 4087194991, 37677478288, 349465615584, 3258501713644, 30522628848972, 287059041039078, 2709339704446862, 25652489700275636
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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Thomas R. Nicely, Some Results of Computational Research in Prime Numbers
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EXAMPLE
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a(2)=2 because there are 2 primes up to 10^2 whose initial digit is 8 (namely 83 and 89).
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MATHEMATICA
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f[n_] := f[n] = PrimePi[9*10^n] - PrimePi[8*10^n] + f[n - 1]; f[0] = 0; Table[ f[n], {n, 0, 12}]
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CROSSREFS
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Cf. A073509 to A073517, their sum is A006880.
Adjacent sequences: A073507 A073508 A073509 this_sequence A073511 A073512 A073513
Sequence in context: A037754 A037642 A097716 this_sequence A007354 A077243 A037525
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KEYWORD
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base,hard,nonn
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AUTHOR
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Shyam Sunder Gupta (guptass(AT)rediffmail.com), Aug 14 2002
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EXTENSIONS
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Edited and extended by Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 29 2002
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