%I #8 Jul 28 2021 04:20:44

%S 2,6,20,26,30,36,44,60,62,66,74,80,86,1004,1034,1046,1086,1094,1104,

%T 1136,1142,1194,1200,1206,1214,1224,1250,1262,1266,1290,1292,1296,

%U 1320,1326,1332,1346,1350,1352,1356,1364,1370,1380,1404,1416,1434,1472,1496

%N Numbers k such that k concatenated with k+7 is a prime.

%Y Cf. A032612.

%K nonn,base

%O 1,1

%A _Patrick De Geest_, May 15 1998