a(n) = largest Ramanujan prime R_k in A104272 that is <= A002386(n).

Terms

a(0) =2a(1) =2a(2) =2a(3) =17a(4) =71a(5) =107a(6) =503a(7) =881a(8) =1103a(9) =1301a(10) =9521a(11) =15671a(12) =19543a(13) =31387a(14) =155849a(15) =360289a(16) =370061a(17) =492067a(18) =1349147a(19) =1356869a(20) =2010553a(21) =4652239a(22) =17051297a(23) =20831119a(24) =47326519a(25) =122164649a(26) =189695483a(27) =191912659