a(n) is the largest odd number k such that 9, 11, ..., k are sums of 3 of first n odd primes.

Terms

a(0) =9a(1) =15a(2) =21a(3) =29a(4) =39a(5) =47a(6) =57a(7) =65a(8) =71a(9) =93a(10) =99a(11) =115a(12) =129a(13) =137a(14) =143a(15) =149a(16) =183a(17) =189a(18) =205a(19) =219a(20) =225a(21) =241a(22) =251a(23) =269a(24) =287a(25) =309a(26) =317a(27) =327a(28) =335a(29) =357