a(n) is the smallest number k such that GCD of n values of prime(j)-1 for successive j values starting with k is greater than 2.
A080373
a(n) is the smallest number k such that GCD of n values of prime(j)-1 for successive j values starting with k is greater than 2.
Terms
- a(0) =3a(1) =6a(2) =24a(3) =77a(4) =271a(5) =271a(6) =1395a(7) =1395a(8) =1395a(9) =13717a(10) =34369a(11) =172146a(12) =172146a(13) =804584a(14) =804584a(15) =804584a(16) =12762142a(17) =16138563a(18) =16138563a(19) =56307979a(20) =56307979a(21) =56307979a(22) =56307979a(23) =56307979a(24) =1857276773a(25) =3511121443
External references
- oeis: A080373