a(n) is the smallest number m, such that m+n is the next prime and m-n is the previous prime.

Terms

a(0) =4a(1) =5a(2) =26a(3) =93a(4) =144a(5) =53a(6) =120a(7) =1839a(8) =532a(9) =897a(10) =1140a(11) =211a(12) =2490a(13) =2985a(14) =4312a(15) =5607a(16) =1344a(17) =9569a(18) =30612a(19) =19353a(20) =16162a(21) =15705a(22) =81486a(23) =16787a(24) =31932a(25) =19635a(26) =35644a(27) =82101a(28) =44322a(29) =43361