Array read by antidiagonals: T(d,k) (k >= 1, d = 1,2,3,4,5,6,...) = smallest semiprime s of k (not necessarily consecutive) semiprimes in arithmetic progression with common difference d, or 0 if there is no such arithmetic progression.
A124570
Array read by antidiagonals: T(d,k) (k >= 1, d = 1,2,3,4,5,6,...) = smallest semiprime s of k (not necessarily consecutive) semiprimes in arithmetic progression with common difference d, or 0 if there is no such arithmetic progression.
Terms
- a(0) =4a(1) =4a(2) =4a(3) =4a(4) =9a(5) =4a(6) =4a(7) =4a(8) =33a(9) =4a(10) =4a(11) =6a(12) =91a(13) =0a(14) =4a(15) =4a(16) =6a(17) =115a(18) =213a(19) =0a(20) =4a(21) =4a(22) =4a(23) =6a(24) =0a(25) =213a(26) =0a(27) =4a(28) =4a(29) =4
External references
- oeis: A124570