|
| |
|
|
A139515
|
|
Denominators of an Egyptian fraction for Pi^(-1), using only prime numbers.
|
|
2
|
| |
|
|
|
OFFSET
|
0,1
|
|
|
COMMENTS
|
Good approximation up to 706 decimal digits.
|
|
|
LINKS
|
Table of n, a(n) for n=0..7.
|
|
|
MAPLE
|
P:=proc(n) local a, b, i, k; a:=evalf(Pi^(-1), 100); for i from 1 by 1 to n do if 1/ithprime(i)<a then a:=a-1/ithprime(i); print(a); print(ithprime(i)); fi; od; end: P(100000);
|
|
|
CROSSREFS
|
Cf. A139514, A139516-A139523.
Sequence in context: A074626 A090186 A205719 * A038708 A042719 A045717
Adjacent sequences: A139512 A139513 A139514 * A139516 A139517 A139518
|
|
|
KEYWORD
|
easy,nonn,frac
|
|
|
AUTHOR
|
Paolo P. Lava and Giorgio Balzarotti, Apr 28 2008
|
|
|
EXTENSIONS
|
Next term has 179 digits.
|
|
|
STATUS
|
approved
|
| |
|
|
