A139522 Denominators of an Egyptian fraction for log(2), using only prime numbers and allowing repetitions.

2, 7, 23, 149, 9967, 27514363, 217357018990141, 1606507138380520696666019221, 25278175600230973831063754126661264411663401021548343, 2658247789993020763205588174060503375422404932907883834101966812060033051648561545028435381434723862291

Offset

0,1

Comments

Good approximation up to 800 decimal digits.

Links

Table of n, a(n) for n=0..9.

Maple

P:=proc(n) local a, i; a:=evalf(ln(2), 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-A139521, A139523.

Sequence in context: A332802 A002494 A032264 * A163158 A355981 A171130

Adjacent sequences: A139519 A139520 A139521 * A139523 A139524 A139525

Keyword

easy,nonn,frac

Author

Paolo P. Lava and Giorgio Balzarotti, Apr 28 2008

Status

approved