Numbers k such that the six numbers 1.prime(k).prime(k+1), prime(k).1.prime(k+1), prime(k).prime(k+1).1, 1.prime(k-1).prime(k), prime(k-1).1.prime(k) and prime(k-1).prime(k).1, where "." denotes concatenation, are primes.

A090871

Numbers k such that the six numbers 1.prime(k).prime(k+1), prime(k).1.prime(k+1), prime(k).prime(k+1).1, 1.prime(k-1).prime(k), prime(k-1).1.prime(k) and prime(k-1).prime(k).1, where "." denotes concatenation, are primes.

Terms

    a(0) =589407a(1) =2372675a(2) =5609052a(3) =5698663a(4) =12353466a(5) =12534100a(6) =14155932a(7) =24208353a(8) =25303609a(9) =30939821a(10) =32915465a(11) =36240880a(12) =37168122a(13) =50679993a(14) =52677223a(15) =60090497a(16) =66071478a(17) =67690661a(18) =75747212a(19) =88096704a(20) =89077730a(21) =98871534a(22) =115631955a(23) =119515953a(24) =127817446a(25) =134262693

External references