a(n) is the least k such that (k*prime(n)#)^2 + 1, ((k+1)*prime(n)#)^2 + 1 and ((k+2)*prime(n)#)^2 + 1 are 3 primes, where prime(n)# is the n-th primorial.
A098765
a(n) is the least k such that (k*prime(n)#)^2 + 1, ((k+1)*prime(n)#)^2 + 1 and ((k+2)*prime(n)#)^2 + 1 are 3 primes, where prime(n)# is the n-th primorial.
Terms
- a(0) =1a(1) =459a(2) =3a(3) =252a(4) =16a(5) =104a(6) =246a(7) =562a(8) =895a(9) =459a(10) =3656a(11) =165a(12) =409a(13) =869a(14) =3075a(15) =1568a(16) =1310a(17) =7723a(18) =4035a(19) =21114a(20) =10634a(21) =2185a(22) =143a(23) =11861a(24) =24850a(25) =3168a(26) =4750a(27) =14373a(28) =565a(29) =22576
External references
- oeis: A098765