A032737 a(n) cannot be prefixed or followed by any digit to form a prime ('empty' suffixes are allowed).

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.

Links

Table of n, a(n) for n=1..33.

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

Cf. A032682-A032685 and A032702-A032733.

Sequence in context: A126784 A071813 A074242 * A237507 A198164 A058003

Adjacent sequences: A032734 A032735 A032736 * A032738 A032739 A032740

Keyword

nonn,base

Author

Patrick De Geest, May 15 1998

Extensions

Offset changed by Andrew Howroyd, Aug 13 2024

Status

approved