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A139396
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Decimal expansion of the alternating sum 1/p(1)-1/[p(2)*p(3)]+1/[p(4)*p(5)*p(6)]...., where p(n) is the n-th prime.
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1
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5, 6, 5, 6, 7, 2, 2, 9, 6, 8, 0, 3, 0, 6, 1, 8, 9, 7, 7, 0, 3, 8, 4, 2, 4, 8, 6, 9, 7, 5, 1, 6, 2, 7, 6, 3, 2, 5, 7, 2, 0, 8, 6, 1, 0, 7, 2, 2, 8, 0, 3, 2, 2, 0, 6, 1, 4, 4, 7, 3, 9, 8, 5, 8, 5, 5, 7, 8, 8, 4, 9, 4, 5, 8, 3, 9, 0, 5, 3, 1, 9, 5, 9, 2, 6, 1, 0, 3, 8, 0, 1, 3, 1, 3, 8, 5, 7, 0, 8, 4
(list; constant; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| Absolute difference between this number and A139395 is about 0.002.
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MAPLE
| P:=proc(n) local a, b, i, j, k; a:=0.5; k:=1; for i from 2 by 1 to n do b:=1; for j from k by 1 to k+i-1 do b:=b*1/ithprime(j+1); od; k:=j; a:=evalf(a+b*(-1)^i, 105); od; print(a); end: P(100);
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CROSSREFS
| Cf. A139395.
Sequence in context: A006944 A010717 A046603 * A010487 A177957 A188942
Adjacent sequences: A139393 A139394 A139395 * A139397 A139398 A139399
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KEYWORD
| easy,nonn,cons
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AUTHOR
| Paolo P. Lava & Giorgio Balzarotti (paoloplava(AT)gmail.com), Apr 18 2008
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