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Search: id:A139515
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| A139515 |
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Denominators of an Egyptian fraction for Pi^(-1), using only prime numbers. |
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+0
3
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| 5, 11, 37, 2677, 4634713, 2181903745507, 684230289204979551524201, 30504579964160123833007038252005864789931483751, 54031514211323998629178201486461663487099408117518574421803621710870978114847632\ 42773981688785752918726648771428001302793403074175919277454095648723384652586809\ 8569857571457844587
(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 706 decimal digits.
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MAPLE
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P:=proc(n) local a, b, i, k; a:=evalf(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, A139516-A139523.
Sequence in context: A077466 A074626 A090186 this_sequence A038708 A042719 A045717
Adjacent sequences: A139512 A139513 A139514 this_sequence A139516 A139517 A139518
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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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