Palindromic odd composite numbers that are the products of an odd number of distinct primes.

Terms

a(0) =555a(1) =595a(2) =777a(3) =969a(4) =1001a(5) =1221a(6) =1551a(7) =1771a(8) =3333a(9) =3553a(10) =5335a(11) =5555a(12) =5665a(13) =5885a(14) =5995a(15) =7337a(16) =7557a(17) =7667a(18) =7777a(19) =7887a(20) =9339a(21) =9669a(22) =9779a(23) =9889a(24) =11211a(25) =11811a(26) =12121a(27) =12621a(28) =12921a(29) =13731