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A068681 Primes formed by the concatenation n, n-2, n. 1
313, 757, 131113, 171517, 312931, 393739, 474547, 494749, 575557, 939193, 111109111, 127125127, 139137139, 147145147, 151149151, 169167169, 189187189, 213211213, 217215217, 227225227, 237235237, 239237239, 247245247, 253251253, 269267269, 331329331, 333331333, 353351353, 363361363, 377375377, 387385387, 389387389, 393391393 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
111109111 is a term as it is the concatenation of 111, 109 and 111.
CROSSREFS
Cf. A068680.
Sequence in context: A104719 A087364 A090514 * A341802 A082436 A108845
KEYWORD
base,easy,nonn
AUTHOR
Amarnath Murthy, Mar 02 2002
EXTENSIONS
More terms from Eli McGowan (ejmcgowa(AT)mail.lakeheadu.ca), Apr 11 2002
STATUS
approved

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Last modified July 15 23:36 EDT 2024. Contains 374341 sequences. (Running on oeis4.)