a(n) is the least palindrome > a(n-1) such that a(1) + a(2) + ... + a(n) is a semiprime.

Terms

a(0) =4a(1) =5a(2) =6a(3) =7a(4) =11a(5) =22a(6) =66a(7) =88a(8) =202a(9) =212a(10) =242a(11) =272a(12) =404a(13) =444a(14) =464a(15) =474a(16) =595a(17) =656a(18) =707a(19) =757a(20) =777a(21) =808a(22) =828a(23) =838a(24) =868a(25) =888a(26) =969a(27) =989a(28) =1111a(29) =1881