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A034819
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Concatenations C1 and C2 and C3 and C4 are all prime (see the comment lines).
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0
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51, 63, 123, 597, 687, 987, 4429, 12237, 18291, 20013, 29953, 31863, 34653, 48023, 52703, 57147, 59337, 62097, 66727, 71733, 81263, 86589, 101211, 105501, 118617, 121397, 134013, 146191, 147151, 155937, 174723, 175797, 179191, 180189, 205287
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| C1 = 'nextprime(n) followed by n'
C2 = 'n followed by nextprime(n)'
C3 = 'prevprime(n) followed by n'
C4 = 'n followed by prevprime(n)'
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EXAMPLE
| n=105501 -> next prime is 105503, previous prime is 105499, thus '105503105501' and '105501105503' and '105501105499' and '105499105501' are all four primes.
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CROSSREFS
| Cf. A034808-A034821.
Sequence in context: A043990 A045068 A050701 * A118147 A015863 A113285
Adjacent sequences: A034816 A034817 A034818 * A034820 A034821 A034822
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KEYWORD
| nonn,base
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AUTHOR
| Patrick De Geest (pdg(AT)worldofnumbers.com), Oct 15 1998.
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