This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A380276 #24 Feb 03 2025 23:02:50
%S A380276 4,7,7,9,9,9,3
%N A380276 Decimal expansion of infinite sum of reciprocals Sum_{n>=1} 1/A357934(n).
%C A380276 Sum of reciprocals of product of two distinct lesser twin primes.
%F A380276 Equals (A342714^2-A356793)/2.
%F A380276 Equals Sum_{m<n and n>=2} 1/(A001359(m)*A001359(n)).
%e A380276 0.47799932... = 1/15 + 1/33 + 1/51 + 1/55 + 1/85 + 1/87 + ...
%Y A380276 Cf. A001359, A342714, A356793, A357934.
%Y A380276 Cf. A209328.
%K A380276 nonn,cons,hard,more
%O A380276 0,1
%A A380276 _Artur Jasinski_, Jan 18 2025