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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 February 8 12:49 EST 2023. Contains 360138 sequences. (Running on oeis4.)