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 A262571 Concatenation of the numbers from 2 to n. 16
 2, 23, 234, 2345, 23456, 234567, 2345678, 23456789, 2345678910, 234567891011, 23456789101112, 2345678910111213, 234567891011121314, 23456789101112131415, 2345678910111213141516, 234567891011121314151617, 23456789101112131415161718, 2345678910111213141516171819 (list; graph; refs; listen; history; text; internal format)
 OFFSET 2,1 LINKS Table of n, a(n) for n=2..19. MATHEMATICA Table[FromDigits[Flatten[IntegerDigits[Range[2, n]]]], {n, 2, 19}] (* Robert Price, Oct 28 2018 *) PROG (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 CROSSREFS 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 KEYWORD nonn,base AUTHOR N. J. A. Sloane, Sep 25 2015 STATUS approved

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Last modified September 22 05:50 EDT 2023. Contains 365519 sequences. (Running on oeis4.)