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A052089 Primes formed by concatenating n with n-1. 10
43, 109, 2221, 2423, 3433, 4241, 5857, 7069, 7877, 8887, 10099, 102101, 108107, 112111, 114113, 124123, 148147, 154153, 160159, 172171, 180179, 192191, 198197, 202201, 208207, 210209, 214213, 238237, 244243, 262261, 264263, 268267, 270269 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

EXAMPLE

2423 is a prime and a concatenation of 24 and 23.

CROSSREFS

Cf. A030458, A052087, A052088.

Sequence in context: A139969 A142055 A068699 * A039471 A104783 A142081

Adjacent sequences:  A052086 A052087 A052088 * A052090 A052091 A052092

KEYWORD

nonn,base

AUTHOR

Patrick De Geest (pdg(AT)worldofnumbers.com), Jan 15 2000.

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Last modified February 16 17:48 EST 2012. Contains 205939 sequences.