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 A090510 a(n) is the least prime beginning with prime(n) such that the concatenation a(1)a(2)...a(n) is a prime. 2
 2, 3, 509, 79, 1163, 13033, 1721, 19, 233, 29569, 3119, 37057, 410171, 43003, 47111, 5323, 59219, 61291, 670223, 710911, 73331, 795793, 83399, 894709, 975581, 101383, 1033079, 1071937, 109073, 1130257, 1276397, 1313911, 1378673, 1395469, 1491233 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Robert Israel, Table of n, a(n) for n = 1..461 MAPLE dcat:= proc(a, b) 10^(1+ilog10(b))*a+b end proc: S:= 2: R:= 2: for n from 2 to 35 do found:= false; for d from 0 while not found do cand:= 10^d*ithprime(n)-1; do cand:= nextprime(cand); if cand >= 10^d*(ithprime(n)+1) then break fi; Sc:= dcat(S, cand); if isprime(Sc) then found:= true; break fi od od; R:= R, cand; S:= Sc; od: R; # Robert Israel, Aug 06 2020 CROSSREFS Cf. A090511. Sequence in context: A128874 A196070 A173342 * A348360 A004887 A240709 Adjacent sequences: A090507 A090508 A090509 * A090511 A090512 A090513 KEYWORD base,nonn AUTHOR Amarnath Murthy, Dec 06 2003 EXTENSIONS More terms from Max Alekseyev, Feb 08 2010 STATUS approved

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Last modified June 14 23:20 EDT 2024. Contains 373401 sequences. (Running on oeis4.)