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A124666
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Numbers ending in 1, 3, 7 or 9 such that either prepending or following them by one digit doesn't produce a prime.
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0
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891, 921, 1029, 1037, 1653, 1763, 1857, 2427, 2513, 2519, 2607, 3111, 3193, 3213, 3501, 3519, 3707, 3953, 4227, 4459, 4599, 4689, 4803, 4863, 5019, 5043, 5047, 5397, 5459, 5489, 5499, 6019, 6023, 6429, 6483, 6609, 6621, 7113
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| If the number doesn't end in 1, 3, 7 or 9, then the prepending requirement is automatically fullfiled. Hence it becomes nonrestrictive and not very interesting.
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EXAMPLE
| The definition means that 891, 1891, 2891, 3891, 4891, 5891, 6891, 7891, 8891, 9891, 8911, 8913, 8917 and 8919 are all composite numbers.
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CROSSREFS
| Sequence in context: A128871 A110726 A204366 * A125303 A087672 A083827
Adjacent sequences: A124663 A124664 A124665 * A124667 A124668 A124669
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KEYWORD
| base,nonn
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AUTHOR
| Tanya Khovanova (tanyakh(AT)yahoo.com), Dec 23 2006
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