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 A049851 Concatenate prevprime(n) and n. 0
 23, 34, 35, 56, 57, 78, 79, 710, 711, 1112, 1113, 1314, 1315, 1316, 1317, 1718, 1719, 1920, 1921, 1922, 1923, 2324, 2325, 2326, 2327, 2328, 2329, 2930, 2931, 3132, 3133, 3134, 3135, 3136, 3137, 3738, 3739, 3740, 3741, 4142, 4143, 4344 (list; graph; refs; listen; history; text; internal format)
 OFFSET 3,1 LINKS MAPLE P:=proc(i) local a, n; for n from 3 by 1 to i do a:=prevprime(n)*10^floor(evalf(log10(n)+1, 100))+n; print(a); od; end: P(100); # Paolo P. Lava, Jan 21 2009 PROG (PARI) a(n) = eval(concat(Str(precprime(n-1)), Str(n))); \\ Michel Marcus, Aug 11 2017 CROSSREFS Cf. A151799. Sequence in context: A145566 A146595 A230123 * A223606 A120147 A166499 Adjacent sequences:  A049848 A049849 A049850 * A049852 A049853 A049854 KEYWORD nonn,base AUTHOR STATUS approved

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Last modified September 28 07:55 EDT 2020. Contains 337394 sequences. (Running on oeis4.)