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A032737
a(n) cannot be prefixed or followed by any digit to form a prime ('empty' suffixes are allowed).
1
5620, 7358, 13308, 13332, 13650, 14612, 26302, 27971, 28472, 28838, 29542, 29650, 31328, 33027, 33170, 35914, 35970, 36186, 39608, 40078, 41165, 41528, 42422, 44657, 47172, 47382, 48046, 48052, 48454, 50774, 52735, 55553, 60222
OFFSET
1,1
COMMENTS
a(n) itself cannot be a prime to start with.
EXAMPLE
55553 prefixed with a digit from (1,2,3,4,5,6,7,8,9) and followed by a digit from ('',1,3,7,9) never yields a prime: '3'55553'_' = 11 x 32323; '2'5620'9' = 3 x 41 x 2083.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, May 15 1998
EXTENSIONS
Offset changed by Andrew Howroyd, Aug 13 2024
STATUS
approved