Prime septets of form k, k+2100, k+4200, k+6300, k+8400, k+10500, k+12600.

Terms

a(0) =1847a(1) =3947a(2) =6047a(3) =8147a(4) =10247a(5) =12347a(6) =14447a(7) =3947a(8) =6047a(9) =8147a(10) =10247a(11) =12347a(12) =14447a(13) =16547a(14) =26497a(15) =28597a(16) =30697a(17) =32797a(18) =34897a(19) =36997a(20) =39097a(21) =34913a(22) =37013a(23) =39113a(24) =41213a(25) =43313a(26) =45413a(27) =47513a(28) =35771a(29) =37871