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A045532
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Concatenate n with n-th prime.
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14
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12, 23, 35, 47, 511, 613, 717, 819, 923, 1029, 1131, 1237, 1341, 1443, 1547, 1653, 1759, 1861, 1967, 2071, 2173, 2279, 2383, 2489, 2597, 26101, 27103, 28107, 29109, 30113, 31127, 32131, 33137, 34139, 35149, 36151, 37157, 38163, 39167, 40173, 41179, 42181
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OFFSET
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1,1
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COMMENTS
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Triangular numbers are 1653, 32131, 79401, ... - Ali Adams, Feb 04 2020
The next such terms are 173340627863131 and 1454987833022905581. - Giovanni Resta, Feb 04 2020
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LINKS
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FORMULA
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MATHEMATICA
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Table[FromDigits[Join[IntegerDigits[n], IntegerDigits[Prime[n]]]], {n, 40}] (* Vincenzo Librandi, Apr 13 2019 *)
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PROG
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(Haskell)
a045532 n = read $ show n ++ show (a000040 n) :: Integer
(Magma) [Seqint(Intseq(NthPrime(n)) cat Intseq(n)): n in [1..45]]; // Vincenzo Librandi, Apr 13 2019
(Python)
from sympy import prime
def a(n): return int(str(n) + str(prime(n)))
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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