Table read by row, where T(n,k), n>0 and k>0, represents the smallest n-digit number that is the product of k distinct primes and is sandwiched between semiprime numbers, or -1 if no such number exists.
A379167
Table read by row, where T(n,k), n>0 and k>0, represents the smallest n-digit number that is the product of k distinct primes and is sandwiched between semiprime numbers, or -1 if no such number exists.
Terms
- a(0) =5a(1) =-1a(2) =34a(3) =-1a(4) =122a(5) =186a(6) =870a(7) =-1a(8) =1042a(9) =1146a(10) =1190a(11) =5610a(12) =-1a(13) =10118a(14) =10002a(15) =10030a(16) =10230a(17) =39270a(18) =-1a(19) =100462a(20) =100158a(21) =100030a(22) =100122a(23) =110670a(24) =881790a(25) =-1a(26) =1000478a(27) =1000022a(28) =1000010a(29) =1000758
External references
- oeis: A379167