a(n) = prime(prime(prime(prime(A028815(n) - 1) - 1) - 1) - 1) - 1.

Terms

a(0) =1a(1) =2a(2) =36a(3) =576a(4) =1492a(5) =4512a(6) =8110a(7) =14778a(8) =18222a(9) =26416a(10) =41452a(11) =51576a(12) =71740a(13) =87552a(14) =96352a(15) =111372a(16) =135660a(17) =167106a(18) =172152a(19) =218550a(20) =238990a(21) =250252a(22) =284148a(23) =317856a(24) =351706a(25) =400408a(26) =441478a(27) =463398a(28) =490246a(29) =505780