A139515 Denominators of an Egyptian fraction for Pi^(-1), using only prime numbers.

5, 11, 37, 2677, 4634713, 2181903745507, 684230289204979551524201, 30504579964160123833007038252005864789931483751

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: A090186 A205719 A332475 * 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