a(1)=2; a(n) for n>1 is the smallest prime number > a(n-1) such that the concatenation of all previous terms is also prime.
A080155
a(1)=2; a(n) for n>1 is the smallest prime number > a(n-1) such that the concatenation of all previous terms is also prime.
Terms
- a(0) =2a(1) =3a(2) =11a(3) =31a(4) =47a(5) =229a(6) =251a(7) =577a(8) =857a(9) =859a(10) =911a(11) =1123a(12) =1223a(13) =1297a(14) =1571a(15) =2161a(16) =2417a(17) =2551a(18) =2879a(19) =3319a(20) =5273a(21) =6121a(22) =6947a(23) =7603a(24) =8273a(25) =12721a(26) =12953a(27) =13291a(28) =15683a(29) =16453
External references
- oeis: A080155