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Search: id:A139523
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| A139523 |
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Denominators of an Egyptian fraction for ln(Pi), using only prime numbers and allowing repetitions. |
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+0
10
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| 2, 2, 7, 541, 41131, 627169013, 81471206061859301, 932806453618297780249534047168397, 4107347676766564181856839919490854246701477594547905851748592091
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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Good approximation up to 799 decimal digits
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MAPLE
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P:=proc(n) local a, i; a:=evalf(ln(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);
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CROSSREFS
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Cf. A139514-A139522.
Sequence in context: A047003 A067352 A062448 this_sequence A158311 A079242 A137384
Adjacent sequences: A139520 A139521 A139522 this_sequence A139524 A139525 A139526
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KEYWORD
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easy,nonn,frac
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AUTHOR
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Paolo P. Lava & Giorgio Balzarotti (ppl(AT)spl.at), Apr 28 2008
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