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Search: id:A073512
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| A073512 |
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Number of primes less than 10^n with initial digit 6. |
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+0
1
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| 0, 2, 18, 135, 1013, 8458, 72257, 628206, 5556434, 49815418, 451476802, 4128049326, 38024311091, 352446754137, 3284400373590, 30749731897370, 289066731934716, 2727216210298152, 25812680778645432
(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 2 (namely 61 and 67).
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MATHEMATICA
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f[n_] := f[n] = PrimePi[7*10^n] - PrimePi[6*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.
Sequence in context: A064447 A043022 A057971 this_sequence A005544 A154636 A001804
Adjacent sequences: A073509 A073510 A073511 this_sequence A073513 A073514 A073515
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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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