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A139395
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Decimal expansion of the 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, 7, 6, 7, 0, 3, 1, 9, 8, 4, 4, 5, 1, 9, 7, 2, 0, 8, 4, 0, 6, 9, 8, 2, 4, 2, 2, 9, 4, 2, 3, 2, 6, 7, 2, 5, 5, 8, 1, 1, 4, 8, 1, 3, 7, 3, 4, 6, 7, 3, 7, 8, 6, 3, 8, 3, 4, 2, 4, 9, 4, 7, 0, 5, 4, 8, 5, 8, 5, 1, 8, 7, 8, 5, 8, 7, 8, 4, 5, 9, 7, 3, 8, 2, 4, 3, 4, 1, 1, 9, 8, 1, 2, 1, 4, 3, 8, 3, 7
(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 A139396 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, 105); od; print(a); end: P(100);
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CROSSREFS
| Cf. A139396.
Sequence in context: A021642 A101288 A095942 * A029911 A205691 A002141
Adjacent sequences: A139392 A139393 A139394 * A139396 A139397 A139398
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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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