Sequence of primorials P# (cf. A002110) such that j*P# has twin prime neighbors for some j with 0 < j < prime following P.

A087651

Sequence of primorials P# (cf. A002110) such that j*P# has twin prime neighbors for some j with 0 < j < prime following P.

Terms

    a(0) =2a(1) =6a(2) =6a(3) =6a(4) =30a(5) =30a(6) =30a(7) =30a(8) =210a(9) =210a(10) =2310a(11) =2310a(12) =2310a(13) =2310a(14) =30030a(15) =30030a(16) =30030a(17) =30030a(18) =30030a(19) =30030a(20) =510510a(21) =510510a(22) =9699690a(23) =223092870a(24) =223092870a(25) =223092870a(26) =223092870a(27) =223092870a(28) =223092870a(29) =223092870

External references