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A213072 Smallest number whose decimal expansion is a concatenation of two primes in n different ways. 1
22, 237, 2337, 29397, 739397, 23932917, 1997771997, 79279391397 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
a(9) <= 4999363379397. - Donovan Johnson, Jun 17 2012
LINKS
EXAMPLE
a(3) = 2337 because 2337 is the smallest number that can be separated into two primes in three different ways: 2 and 337, 23 and 37, 233 and 7.
CROSSREFS
Sequence in context: A003205 A037268 A091783 * A159649 A046499 A126903
KEYWORD
nonn,base
AUTHOR
Claudio Meller, Jun 04 2012
EXTENSIONS
a(5)-a(6) from David W. Wilson, Jun 04 2012
a(7)-a(8) from Donovan Johnson, Jun 16 2012
STATUS
approved

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Last modified June 21 18:50 EDT 2024. Contains 373557 sequences. (Running on oeis4.)