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 A045533 Concatenate the n-th and (n+1)st prime. 21
 23, 35, 57, 711, 1113, 1317, 1719, 1923, 2329, 2931, 3137, 3741, 4143, 4347, 4753, 5359, 5961, 6167, 6771, 7173, 7379, 7983, 8389, 8997, 97101, 101103, 103107, 107109, 109113, 113127, 127131, 131137 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..10000 FORMULA a(n) = prime(n)*(10^floor(log_10(prime(n+1)))+1) + prime(n+1). - Conner L. Delahanty, May 10 2014 MAPLE P:=proc(i) local a, b, n; for n from 1 by 1 to i do a:=ithprime(n); b:=ithprime(n+1); a:=b+a*10^floor(evalf((log10(b)+1), 100)); print(a); od; end: P(100); # Paolo P. Lava, Jan 21 2009 MATHEMATICA #[[1]]*10^IntegerLength[#[[2]]]+#[[2]]&/@Partition[Prime[Range[40]], 2, 1] (* Harvey P. Dale, Jun 06 2015 *) PROG (Haskell) a045533 n = a045533_list !! (n-1) a045533_list = f \$ map show a000040_list :: [Integer] where    f (t:ts@(t':_)) = read (t ++ t') : f ts -- Reinhard Zumkeller, Apr 20 2012 (PARI) a(n) = eval(concat(Str(prime(n)), Str(prime(n+1)))); \\ Michel Marcus, May 11 2014 (MAGMA) [Seqint(Intseq(NthPrime(n+1)) cat Intseq(NthPrime(n))): n in [1..50 ] ]; // Marius A. Burtea, Mar 21 2019 CROSSREFS Cf. A077800, A095958 (subsequence), A030461 (primes). Sequence in context: A223606 A120147 A166499 * A329179 A154114 A163384 Adjacent sequences:  A045530 A045531 A045532 * A045534 A045535 A045536 KEYWORD nonn,base AUTHOR N. J. A. Sloane, Dec 11 1999 EXTENSIONS Offset changed to 1, in agreement with (almost?) all references to this sequence, by M. F. Hasler STATUS approved

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Last modified October 22 05:01 EDT 2020. Contains 337950 sequences. (Running on oeis4.)