First prime of a pair, formed by concatenating n, n+1, the second prime (not shown) formed by concatenating n+2, n+3.

A156121

First prime of a pair, formed by concatenating n, n+1, the second prime (not shown) formed by concatenating n+2, n+3.

Terms

    a(0) =67a(1) =7879a(2) =9091a(3) =186187a(4) =276277a(5) =426427a(6) =438439a(7) =450451a(8) =600601a(9) =606607a(10) =798799a(11) =816817a(12) =858859a(13) =936937a(14) =960961a(15) =11401141a(16) =13981399a(17) =15361537a(18) =17461747a(19) =17881789a(20) =18961897a(21) =21002101a(22) =21902191a(23) =22082209a(24) =27362737a(25) =28802881

External references