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) =19a(1) =1657a(2) =13a(3) =9001a(4) =283a(5) =115201a(6) =61507a(7) =249439a(8) =375127a(9) =472831a(10) =786823a(11) =172489a(12) =1237a(13) =2359033a(14) =163063a(15) =961981a(16) =1442017a(17) =457a(18) =1208833a(19) =4845583a(20) =1146877a(21) =11550193a(22) =436831a(23) =1911031a(24) =581047a(25) =4504351a(26) =215737a(27) =3685051a(28) =27805381a(29) =1343791