Numbers with d digits (d>0) which have at least 2d distinct primes as substrings.

Terms

a(0) =1373a(1) =3137a(2) =3797a(3) =5237a(4) =6173a(5) =11317a(6) =11373a(7) =13733a(8) =13739a(9) =13797a(10) =17331a(11) =19739a(12) =19973a(13) =21137a(14) =21317a(15) =21373a(16) =21379a(17) =22397a(18) =22937a(19) =23117a(20) =23137a(21) =23173a(22) =23371a(23) =23373a(24) =23719a(25) =23797a(26) =23971a(27) =24373a(28) =26173a(29) =26317