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A032702
Numbers k such that k prefixed by '2' and followed by '1' is prime.
29
1, 4, 5, 7, 8, 11, 13, 14, 16, 22, 25, 28, 31, 34, 35, 37, 38, 41, 44, 52, 53, 55, 59, 62, 67, 71, 73, 74, 79, 80, 85, 86, 97, 100, 101, 103, 106, 110, 112, 119, 121, 122, 134, 139, 140, 148, 149, 152, 160, 161, 166, 170, 175, 182, 184, 185, 187, 188, 191, 196
OFFSET
1,2
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, May 15 1998
EXTENSIONS
Offset changed by Andrew Howroyd, Aug 11 2024
STATUS
approved