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Search: id:A158075
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| A158075 |
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Prime numbers p such that largest digit of p - smallest digit of p = prime. |
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+0
1
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| 13, 29, 31, 41, 47, 53, 61, 79, 83, 97, 103, 107, 113, 131, 163, 181, 227, 229, 239, 241, 257, 269, 277, 281, 293, 307, 311, 313, 331, 353, 383, 421, 431, 449, 457, 461, 463, 467, 479, 499, 503, 523, 547, 557, 563, 577, 587, 607, 613, 631, 641, 643, 647, 653
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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Chris Caldwell, The First 1000 Primes
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EXAMPLE
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13 (3-1=2), 29 (9-2=7), 31 (3-1=2), 47 (7-4=3), 53 (5-3=2), etc.
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MAPLE
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a := proc (n) local nn, nnn: nn := convert(ithprime(n), base, 10): nnn := seq(nn[j], j = 1 .. nops(nn)): if isprime(max(nnn)-min(nnn)) = true then ithprime(n) else end if end proc: seq(a(n), n = 1 .. 150); [From Emeric Deutsch (deutsch(AT)duke.poly.edu), Apr 01 2009]
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CROSSREFS
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Cf. A000040.
Sequence in context: A018955 A087593 A158281 this_sequence A087594 A088909 A096451
Adjacent sequences: A158072 A158073 A158074 this_sequence A158076 A158077 A158078
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KEYWORD
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nonn
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AUTHOR
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Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Mar 12 2009
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EXTENSIONS
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Missing terms (61,281,449,457,461,463,467,479,727,757,769) added by Emeric Deutsch (deutsch(AT)duke.poly.edu), Apr 01 2009
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