a(0)=0; thereafter a(n) is the smallest prime not less than a(n-1) such that a(n - 1) + a(n) is a product of n primes.

A280061

a(0)=0; thereafter a(n) is the smallest prime not less than a(n-1) such that a(n - 1) + a(n) is a product of n primes.

Terms

    a(0) =0a(1) =2a(2) =2a(3) =43a(4) =47a(5) =61a(6) =83a(7) =109a(8) =467a(9) =1453a(10) =2003a(11) =4909a(12) =18131a(13) =24877a(14) =32467a(15) =225581a(16) =603859a(17) =944429a(18) =1267411a(19) =1485101a(20) =2447059a(21) =9349421a(22) =25253587a(23) =53389613a(24) =88168147a(25) =100575533a(26) =151082707a(27) =989767981a(28) =3596703443a(29) =6738061613

External references