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A139522 Denominators of an Egyptian fraction for log(2), using only prime numbers and allowing repetitions. 2
2, 7, 23, 149, 9967, 27514363, 217357018990141, 1606507138380520696666019221, 25278175600230973831063754126661264411663401021548343, 2658247789993020763205588174060503375422404932907883834101966812060033051648561545028435381434723862291 (list; graph; refs; listen; history; text; internal format)
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: A049021 A002494 A032264 * A163158 A171130 A112089

Adjacent sequences:  A139519 A139520 A139521 * A139523 A139524 A139525

KEYWORD

easy,nonn,frac

AUTHOR

Paolo P. Lava and Giorgio Balzarotti, Apr 28 2008

STATUS

approved

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Last modified January 22 08:58 EST 2018. Contains 298042 sequences.