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Search: id:A053008
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| A053008 |
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Primes from products of split even-digit primes. |
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+0
3
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| 3, 7, 3, 7, 103, 109, 103, 409, 601, 109, 709, 907, 523, 139, 193, 853, 379, 397, 739, 937, 499, 223, 499, 1621, 6121, 6211, 4261, 6421, 2017, 2551, 5521, 139, 769, 967, 997, 109, 4111, 1153, 1531, 3511, 859, 139, 193, 1873, 3187, 8317, 1051, 5011, 1483
(list; graph; listen)
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OFFSET
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0,1
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REFERENCES
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C. A. Pickover, chapter 30 of Keys to Infinity. NY: Wiley, 1995. Pages 227-231.
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FORMULA
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Take even-digit primes, split digits into two halves, multiply the halves and form primes by rearranging digits. [If split in right half results in a leading zero, that prime is skipped.]
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EXAMPLE
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a(5)=103 because from the prime 1013 we get 10 and 13 after the split; 10*13=130, and the digits 1 3 0 can be arranged to form 103, prime.
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CROSSREFS
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Cf. A053009, A053010.
Adjacent sequences: A053005 A053006 A053007 this_sequence A053009 A053010 A053011
Sequence in context: A120124 A113832 A115631 this_sequence A053010 A118452 A133056
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KEYWORD
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easy,nonn
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AUTHOR
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Enoch Haga (Enokh(AT)comcast.net), Feb 21 2000
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