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A034813 Concatenations C1 and C2 are both prime (see the comment lines). +0
1
36, 74, 104, 132, 188, 222, 224, 305, 317, 344, 367, 368, 389, 457, 458, 475, 540, 572, 584, 608, 631, 676, 682, 689, 697, 738, 756, 760, 781, 797, 829, 841, 893, 910, 911, 914, 928, 982, 1018, 1104, 1122, 1178, 1186, 1317, 1328, 1391, 1402, 1406, 1518 (list; graph; listen)
OFFSET

0,1

COMMENT

C1 = 'prevprime(n) followed by n followed by nextprime(n)'

C2 = 'nextprime(n) followed by n followed by prevprime(n)'

EXAMPLE

n=797 -> previous prime is 787, next prime is 809, thus '787797809' and '809797787' are both primes.

CROSSREFS

Cf. A034808-A034821.

Sequence in context: A024973 A024975 A025399 this_sequence A111163 A136359 A084006

Adjacent sequences: A034810 A034811 A034812 this_sequence A034814 A034815 A034816

KEYWORD

nonn,base

AUTHOR

Patrick De Geest (pdg(AT)worldofnumbers.com), Oct 15 1998.

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Last modified December 4 14:15 EST 2008. Contains 151279 sequences.


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