a(n) = prevprime(n)*nextprime(n).

Terms

a(0) =10a(1) =15a(2) =21a(3) =35a(4) =55a(5) =77a(6) =77a(7) =77a(8) =91a(9) =143a(10) =187a(11) =221a(12) =221a(13) =221a(14) =247a(15) =323a(16) =391a(17) =437a(18) =437a(19) =437a(20) =551a(21) =667a(22) =667a(23) =667a(24) =667a(25) =667a(26) =713a(27) =899a(28) =1073a(29) =1147