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A034809 Concatenation of 'n and prevprime(n)' is a prime. 1
4, 5, 9, 10, 16, 24, 33, 36, 42, 46, 51, 53, 56, 59, 63, 66, 67, 69, 75, 76, 78, 81, 87, 96, 102, 106, 108, 111, 114, 116, 123, 125, 129, 130, 135, 137, 144, 145, 147, 148, 153, 156, 159, 170, 171, 177, 179, 180, 184, 187, 190, 192, 195, 196, 198, 207, 211, 214 (list; graph; refs; listen; history; internal format)
OFFSET

0,1

EXAMPLE

n=156 -> previous prime is 151 and '156151' is a prime.

CROSSREFS

Cf. A034808-A034821.

Sequence in context: A050036 A059582 A189889 * A096808 A067261 A001161

Adjacent sequences:  A034806 A034807 A034808 * A034810 A034811 A034812

KEYWORD

nonn,base

AUTHOR

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

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Last modified February 14 11:36 EST 2012. Contains 205623 sequences.