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A032736 a(n) cannot be prefixed or followed by any digit to form a prime ('empty' prefixes allowed). 0
14612, 27971, 29289, 33170, 36186, 38327, 39608, 40078, 41165, 41528, 43277, 44657, 47382, 55553, 55791, 58899, 60806, 62318, 63056, 65970, 66818, 70558, 73851, 80477, 81167, 83986, 86145, 89072, 89280, 90379, 91538, 93160, 96222 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..32.

EXAMPLE

60806 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: '_'60806'3' = 43 x 79 x 179; '1'14612'3' = 3^3 x 11 x 17 x 227.

CROSSREFS

Cf. A032682-A032685 and A032702-A032733.

Sequence in context: A175973 A265651 A153428 * A032738 A252218 A133858

Adjacent sequences:  A032733 A032734 A032735 * A032737 A032738 A032739

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, May 15 1998

STATUS

approved

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Last modified March 8 11:41 EST 2021. Contains 341948 sequences. (Running on oeis4.)