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Search: id:A090195
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| A090195 |
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Primes which when multiplied by their largest digit and 1 is subtracted form another prime. |
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+0
1
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| 2, 41, 163, 181, 211, 431, 463, 613, 653, 853, 1163, 1381, 1483, 1613, 1801, 1861, 1873, 2011, 2063, 2141, 2221, 2243, 2411, 2633, 2851, 3041, 3181, 3583, 3623, 4211, 4241, 4363, 4421, 4463, 4483, 4603, 5563, 5581, 5821, 5851, 6113, 6143, 6203, 6553
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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In the prime sequence, select largest digit in each prime, multiply by the prime containing that digit, then subtract 1. If the result is another prime, add to sequence.
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EXAMPLE
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a(2)=41. Largest digit is 4. Multiply 41*4=164. 164-1=163, prime.
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CROSSREFS
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Cf. A060418.
Sequence in context: A047936 A007533 A088565 this_sequence A063271 A142160 A109125
Adjacent sequences: A090192 A090193 A090194 this_sequence A090196 A090197 A090198
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KEYWORD
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easy,nonn,base
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AUTHOR
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Enoch Haga (Enokh(AT)comcast.net), Jan 22 2004
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