Number of pairs of consecutive integers x, x+1 such that all prime factors of both x and x+1 are at most the n-th prime.
A002071
Number of pairs of consecutive integers x, x+1 such that all prime factors of both x and x+1 are at most the n-th prime.
Terms
- a(0) =1a(1) =4a(2) =10a(3) =23a(4) =40a(5) =68a(6) =108a(7) =167a(8) =241a(9) =345a(10) =482a(11) =653a(12) =869a(13) =1153a(14) =1502a(15) =1930a(16) =2454a(17) =3106a(18) =3896a(19) =4839a(20) =6040
External references
- oeis: A002071