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A262571
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Concatenation of the numbers from 2 to n.
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16
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2, 23, 234, 2345, 23456, 234567, 2345678, 23456789, 2345678910, 234567891011, 23456789101112, 2345678910111213, 234567891011121314, 23456789101112131415, 2345678910111213141516, 234567891011121314151617, 23456789101112131415161718, 2345678910111213141516171819
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OFFSET
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2,1
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LINKS
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Table of n, a(n) for n=2..19.
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MATHEMATICA
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Table[FromDigits[Flatten[IntegerDigits[Range[2, n]]]], {n, 2, 19}] (* Robert Price, Oct 28 2018 *)
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PROG
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(MAGMA) [Seqint(Reverse(&cat[Reverse(Intseq(k)): k in [2..n]])): n in [2..20]]; // Vincenzo Librandi, Oct 29 2018
(Python)
def a(n): return int("".join(map(str, range(2, n+1))))
print([a(n) for n in range(2, 20)]) # Michael S. Branicky, Feb 23 2021
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CROSSREFS
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For primes in this sequence see A089987.
Cf. A007908, A262299, A262572-A262582.
See A262300 for more about this problem.
Sequence in context: A088094 A112782 A093672 * A283560 A159902 A301339
Adjacent sequences: A262568 A262569 A262570 * A262572 A262573 A262574
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KEYWORD
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nonn,base
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AUTHOR
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N. J. A. Sloane, Sep 25 2015
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STATUS
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approved
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