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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 Table of n, a(n) for n=0..34. EXAMPLE n=105501 -> next prime is 105503, previous prime is 105499, thus '105503105501' and '105501105503' and '105501105499' and '105499105501' are all four primes. CROSSREFS Cf. A034808-A034821. Sequence in context: A050701 A206525 A216055 * A335346 A118147 A015863 Adjacent sequences: A034816 A034817 A034818 * A034820 A034821 A034822 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.)