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Search: id:A112419
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| A112419 |
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Prime Friedman numbers. |
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+0
1
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| 127, 347, 2503, 12101, 12107, 12109, 15629, 15641, 15661, 15667, 15679, 16381, 16447, 16759, 19739
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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A Friedman number is one which is expressible in a nontrivial manner with the same digits by means of the arithmetic operations +, -, *, "divided by" along with ^ and digit concatenation.
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EXAMPLE
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Since the following primes have expressions 16381 = (1+1)^(6+8) - 3 ; 16447 = -1+64+4^7 ; 16759 = 7^5 - 6*(9-1), they are in the sequence.
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CROSSREFS
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Cf. A036057.
Sequence in context: A031933 A080035 A162004 this_sequence A142201 A142889 A095312
Adjacent sequences: A112416 A112417 A112418 this_sequence A112420 A112421 A112422
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KEYWORD
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more,nonn
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AUTHOR
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Lekraj Beedassy (blekraj(AT)yahoo.com), Jan 23 2007
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