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 A034817 Concatenations C1 and C2 and C3 are all prime (see the comment lines). 0
 63, 333, 621, 3339, 4557, 8127, 13977, 16827, 18177, 21921, 27393, 34989, 40023, 40047, 46917, 59727, 61203, 79467, 94767, 95079, 100821, 102771, 104859, 106527, 113883, 114123, 143433, 147123, 156201, 158409, 160149, 196737, 209277, 209961 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS C1 = 'prevprime(n) followed by n' C2 = 'n followed by nextprime(n)' C3 = 'prevprime(n) followed by n followed by nextprime(n)' LINKS Table of n, a(n) for n=0..33. EXAMPLE n=95079 -> previous prime is 95071, next prime is 95083, thus '9501795079' and '9507995083' and '950719507995083' are all three primes. CROSSREFS Cf. A034808-A034821. Sequence in context: A138833 A204736 A160674 * A160895 A203556 A038993 Adjacent sequences: A034814 A034815 A034816 * A034818 A034819 A034820 KEYWORD nonn,base AUTHOR Patrick De Geest, Oct 15 1998 STATUS approved

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Last modified June 3 14:25 EDT 2023. Contains 363116 sequences. (Running on oeis4.)