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Search: id:A034820
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| A034820 |
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Concatenations C1 and C2 and C3 and C4 are all prime (see the comment lines). |
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+0
2
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| 16776, 41719, 164612, 188435, 188682, 312184, 317594, 392771, 397617, 450413, 476055, 486283, 492240, 497913, 539471, 584029, 620029, 640883, 648445, 656757, 903009, 992790, 993475, 995917, 1045387, 1082078, 1194606, 1252496, 1322841
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OFFSET
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0,1
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COMMENT
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C1 = 'prevprime(n) followed by n followed by prevprime(n)'
C2 = 'prevprime(n) followed by n followed by nextprime(n)'
C3 = 'nextprime(n) followed by n followed by prevprime(n)'
C4 = 'nextprime(n) followed by n followed by nextprime(n)'
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EXAMPLE
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n=41719 -> next prime is 41729, previous prime is 41687, thus '416874171941687' and '416874171941729' and '417294171941687' and '417294171941729' are all four primes.
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CROSSREFS
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Cf. A034808-A034821.
Sequence in context: A128383 A052190 A068784 this_sequence A053074 A115923 A147698
Adjacent sequences: A034817 A034818 A034819 this_sequence A034821 A034822 A034823
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KEYWORD
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nonn,base
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AUTHOR
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Patrick De Geest (pdg(AT)worldofnumbers.com), Oct 15 1998.
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