Least prime p such that p*10^n-1, p*10^n-3, p*10^n-7 and p*10^n-9 are all prime.

Terms

a(0) =2a(1) =2a(2) =10193a(3) =24851a(4) =20549a(5) =719a(6) =22133a(7) =230471a(8) =46679a(9) =432449a(10) =114689a(11) =227603a(12) =305297a(13) =61463a(14) =1866467a(15) =866309a(16) =1189403a(17) =362081a(18) =2615783a(19) =493433a(20) =966353a(21) =4154363a(22) =6562931a(23) =9096203a(24) =3701627a(25) =3128813a(26) =20983727a(27) =303593a(28) =24437537a(29) =1068491