Terms k in A025487 such that k-1 and k+1 are twin primes.

Terms

a(0) =4a(1) =6a(2) =12a(3) =30a(4) =60a(5) =72a(6) =180a(7) =192a(8) =240a(9) =420a(10) =432a(11) =1152a(12) =2310a(13) =2592a(14) =3360a(15) =6300a(16) =7560a(17) =9240a(18) =15360a(19) =21600a(20) =23040a(21) =26880a(22) =55440a(23) =100800a(24) =110880a(25) =138240a(26) =180180a(27) =241920a(28) =264600a(29) =345600