Primes p such that if q is the next prime after p then the concatenation of p with q and the concatenation of q with p are both primes.
A225575
Primes p such that if q is the next prime after p then the concatenation of p with q and the concatenation of q with p are both primes.
Terms
- a(0) =199a(1) =233a(2) =257a(3) =353a(4) =523a(5) =653a(6) =971a(7) =1973a(8) =2333a(9) =3259a(10) =3637a(11) =3761a(12) =4283a(13) =4993a(14) =5927a(15) =6353a(16) =6529a(17) =6563a(18) =7907a(19) =8831a(20) =9293a(21) =9851a(22) =10711a(23) =10861a(24) =11731a(25) =13037a(26) =13177a(27) =13681a(28) =15241a(29) =16381
External references
- oeis: A225575