Prime substrings of prime numbers in A037272.

Terms

a(0) =2a(1) =11a(2) =2a(3) =3a(4) =3a(5) =3a(6) =3a(7) =11a(8) =139a(9) =653a(10) =3863a(11) =5107a(12) =3a(13) =11a(14) =7a(15) =73a(16) =2a(17) =2a(18) =3a(19) =13a(20) =367a(21) =11a(22) =29a(23) =3a(24) =163a(25) =6373a(26) =2a(27) =3a(28) =3a(29) =3