a(n) is the smallest composite number c such that A002110(n) + c is prime.

Terms

a(0) =4a(1) =9a(2) =25a(3) =49a(4) =121a(5) =221a(6) =289a(7) =529a(8) =667a(9) =899a(10) =1147a(11) =1591a(12) =2021a(13) =1849a(14) =2773a(15) =3551a(16) =4087a(17) =4819a(18) =4757a(19) =5041a(20) =7519a(21) =7663a(22) =8549a(23) =9991a(24) =10379a(25) =13231a(26) =11227a(27) =14659a(28) =11881a(29) =21877