Search: id:A082020
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%I A082020
%S A082020 1,5,1,9,8,1,7,7,5,4,6,3,5,0,6,6,5,7,1,6,5,8,1,9,1,9,4,8,1,4,5,9,1,
%T A082020 4,5,8,3,5,6,5,3,8,1,6,2,0,0,8,3,6,9,8,2,3,2,6,8,4,1,3,5,4,7,8,4,1,
%U A082020 2,5,9,6,8,1,4,4,3,3,5,3,1,6,1,7,8,6,8,1,3,9,1,0,8,8,8,4,3,2,7,5,6
%N A082020 Decimal expansion of 15/Pi^2.
%D A082020 S. Ramanujan, Irregular numbers, J. Indian Math. Soc., 5 (1913), 105-106; 
               Coll. Papers 20-21.
%H A082020 S. Ramanujan, <a href="http://www.imsc.res.in/~rao/ramanujan/CamUnivCpapers/
               Cpaper4/page1.htm">Irregular numbers</a>
%H A082020 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               PrimeSums.html">Prime Sums</a>
%H A082020 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               MoebiusFunction.html">Moebius Function</a>
%H A082020 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               PrimeProducts.html">Prime Products</a>
%F A082020 Product_{n >= 1} (1+1/prime(n)^2) = 15/Pi^2. - Ramanujan
%e A082020 1.51981775463506657...
%Y A082020 Sequence in context: A154605 A114594 A021662 this_sequence A147406 A147354 
               A134233
%Y A082020 Adjacent sequences: A082017 A082018 A082019 this_sequence A082021 A082022 
               A082023
%K A082020 nonn,cons
%O A082020 1,2
%A A082020 N. J. A. Sloane (njas(AT)research.att.com), May 09 2003

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