A139517 Denominators of an Egyptian fraction for e^(-1), using only prime numbers.

3, 29, 15787, 167776541, 4645498532379389, 1088248917469233866137385062583, 20134824338000979687246821562710150100678729578625534526933, 7555384973907056074914229240175821963966793778695751877194777853748248059480070724299647198101903944083524382569707

Offset

0,1

Comments

Good approximation up to 799 decimal digits

Links

Table of n, a(n) for n=0..7.

Maple

P:=proc(n) local a, i; a:=evalf(exp(1)^(-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, A139518-A139523.

Sequence in context: A270480 A229051 A006526 * A156026 A171883 A112981

Adjacent sequences: A139514 A139515 A139516 * A139518 A139519 A139520

Keyword

easy,nonn,frac

Author

Paolo P. Lava and Giorgio Balzarotti, Apr 28 2008

Status

approved