Concatenation of prime p and nextprime(p) is prime -> cycles of 4 steps possible.

A036341

Concatenation of prime p and nextprime(p) is prime -> cycles of 4 steps possible.

Terms

    a(0) =127787377a(1) =1510818931a(2) =3147482977a(3) =3307903909a(4) =3621408103a(5) =3964636549a(6) =7224979183a(7) =7881628361a(8) =8043354509a(9) =8740618759a(10) =10091655397a(11) =10164789521a(12) =10194261067a(13) =10380609119a(14) =10436432219a(15) =11472028801a(16) =12059694769a(17) =13887362681a(18) =14880879703a(19) =15197340049

External references