|
| |
|
|
A073514
|
|
Number of primes less than 10^n with initial digit 4.
|
|
0
| |
|
|
0, 3, 20, 139, 1069, 8747, 74114, 641594, 5661135, 50653546, 458352691, 4185483176, 38510936699, 356622729564, 3320632228693, 31067060521057, 291869049531878, 2752144407792176, 26035873192178041
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,2
|
|
|
LINKS
| Thomas R. Nicely, Some Results of Computational Research in Prime Numbers
|
|
|
EXAMPLE
| a(2)=3 because there are 3 primes up to 10^2 whose initial digit is 4 (namely 41, 43 and 47).
|
|
|
MATHEMATICA
| f[n_] := f[n] = PrimePi[5*10^n] - PrimePi[4*10^n] + f[n - 1]; f[0] = 0; Table[ f[n], {n, 0, 13}]
|
|
|
CROSSREFS
| Cf. A073509 to A073517, their sum is A006880.
Sequence in context: A056298 A114479 A074574 * A163065 A082143 A009156
Adjacent sequences: A073511 A073512 A073513 * A073515 A073516 A073517
|
|
|
KEYWORD
| base,hard,nonn
|
|
|
AUTHOR
| Shyam Sunder Gupta (guptass(AT)rediffmail.com), Aug 14 2002
|
|
|
EXTENSIONS
| Edited and extended by Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 29 2002
|
| |
|
|
