A139519 Denominators of an Egyptian fraction for Euler-Mascheroni constant, using only prime numbers and allowing repetitions.

2, 13, 3433, 770741, 9157546933, 68379695298643311959, 177698848753108581519320740556520784033, 191429752162010655176200572455622919752517437701651231352646653127630507601

Offset

0,1

Comments

Good approximation up to 801 decimal digits

Links

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

Maple

P:=proc(n) local a, i; a:=evalf(gamma, 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-A139518, A139520-A139523.

Sequence in context: A103641 A144983 A110820 * A306206 A111016 A176947

Adjacent sequences: A139516 A139517 A139518 * A139520 A139521 A139522

Keyword

easy,nonn,frac

Author

Paolo P. Lava and Giorgio Balzarotti, Apr 28 2008

Status

approved