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A034819 Concatenations C1 and C2 and C3 and C4 are all prime (see the comment lines). 0
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; text; internal format)
OFFSET
0,1
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)'
LINKS
EXAMPLE
n=105501 -> next prime is 105503, previous prime is 105499, thus '105503105501' and '105501105503' and '105501105499' and '105499105501' are all four primes.
CROSSREFS
Sequence in context: A050701 A206525 A216055 * A335346 A118147 A015863
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, Oct 15 1998
STATUS
approved

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Last modified July 18 04:35 EDT 2024. Contains 374377 sequences. (Running on oeis4.)