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 A173634 #18 Jul 21 2025 02:40:43 %S A173634 2,6,8,10,12,14,16,18,20,24,26,30,32,36,38,42,44,48,50,54,56,60,62,66, %T A173634 68,72,74,80,86,90,92,98,102,104,110,116,120,122,128,132,140,146,150, %U A173634 152,158,170,176,182,188,200,206,212,230,232,236,242,260,266,272,284,290,314,320,344,350,372,386,398,424,428,452,484,512,542,556,564,572,626,632,644,686,692,764,962,986,1022,1028,1070,1532,1712,1742,1766,2078,2582,2624 %N A173634 Even numbers that are not the sum of 2 Ramanujan primes (A104272). %C A173634 No other terms < 2*10^8. Conjectured to be complete. %C A173634 a(n) = 2*(n of A204814) when A204814(n) = 0. Related to Goldbach's conjecture in that (Conjecture:) even numbers 2626 and greater are the sum of two Ramanujan primes. - _John W. Nicholson_, Jan 26 2017 %H A173634 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/RamanujanPrime.html">Ramanujan Prime</a> %H A173634 Wikipedia, <a href="http://en.wikipedia.org/wiki/Ramanujan_prime">Ramanujan prime</a> %e A173634 68 is a term because no 2 Ramanujan primes sum to 68. 70 is not a term because 11 + 59 = 70. 11 and 59 are both Ramanujan primes. %Y A173634 Cf. A104272, A204814. %K A173634 nonn %O A173634 1,1 %A A173634 _Donovan Johnson_, Nov 23 2010