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A032622
Numbers k such that k concatenated with k+7 is a prime.
2
2, 6, 20, 26, 30, 36, 44, 60, 62, 66, 74, 80, 86, 1004, 1034, 1046, 1086, 1094, 1104, 1136, 1142, 1194, 1200, 1206, 1214, 1224, 1250, 1262, 1266, 1290, 1292, 1296, 1320, 1326, 1332, 1346, 1350, 1352, 1356, 1364, 1370, 1380, 1404, 1416, 1434, 1472, 1496
OFFSET
1,1
CROSSREFS
Cf. A032612.
Sequence in context: A370968 A343506 A128447 * A104749 A062281 A267124
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, May 15 1998
STATUS
approved