Triangle read by rows: row n contains sequence S_n = [s(1), ..., s(n)] where s(1) is the least semiprime pq such that the recurrence s(i+1) = sum of two prime factors of s(i) generates a chain of exactly n semiprimes.
A171095
Triangle read by rows: row n contains sequence S_n = [s(1), ..., s(n)] where s(1) is the least semiprime pq such that the recurrence s(i+1) = sum of two prime factors of s(i) generates a chain of exactly n semiprimes.
Terms
- a(0) =4a(1) =9a(2) =6a(3) =14a(4) =9a(5) =6a(6) =33a(7) =14a(8) =9a(9) =6a(10) =62a(11) =33a(12) =14a(13) =9a(14) =6a(15) =177a(16) =62a(17) =33a(18) =14a(19) =9a(20) =6a(21) =886a(22) =445a(23) =94a(24) =49a(25) =14a(26) =9a(27) =6a(28) =2649a(29) =886
External references
- oeis: A171095