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 A176558 a(n) is the reverse concatenation of divisors of n. 34
 1, 21, 31, 421, 51, 6321, 71, 8421, 931, 10521, 111, 1264321, 131, 14721, 15531, 168421, 171, 1896321, 191, 20105421, 21731, 221121, 231, 2412864321, 2551, 261321, 27931, 28147421, 291, 30151065321, 311, 32168421, 331131, 341721, 35751, 361812964321, 371 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Union of A089374(n) for n >= 1 and A175354(n) for n >= 2. - Jonathan Vos Post, Apr 17 2011 LINKS Indranil Ghosh, Table of n, a(n) for n = 1..50000 EXAMPLE For n=12; divisors of 12: 1,2,3,4,6,12; a(12)=1264321 (reverse concatenation). MAPLE a:= n-> parse(cat(sort([numtheory[divisors](n)[]], `>`)[])): seq(a(n), n=0..40);  # Alois P. Heinz, Dec 31 2020 MATHEMATICA Table[FromDigits@ Flatten@ Map[IntegerDigits, Reverse@ Divisors@ n], {n, 34}] (* Michael De Vlieger, Jan 23 2017 *) PROG (PARI) a(n) = {s = ""; fordiv(n, d, s = concat(Str(d), s)); eval(s); } \\ Michel Marcus, Feb 16 2015 (Python) from sympy import divisors def a(n): return int("".join(str(d) for d in divisors(n)[::-1])) print([a(n) for n in range(1, 35)]) # Michael S. Branicky, Dec 31 2020 CROSSREFS Cf. A089374, A175354, A175355, A176588, A176589. Sequence in context: A032013 A324489 A256824 * A243360 A068657 A068671 Adjacent sequences:  A176555 A176556 A176557 * A176559 A176560 A176561 KEYWORD nonn,base AUTHOR Jaroslav Krizek, Apr 20 2010 EXTENSIONS More terms from Charles R Greathouse IV, Apr 23 2010 Corrected by Jaroslav Krizek, Apr 26 2010 Edited by Charles R Greathouse IV, Apr 30 2010 STATUS approved

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Last modified April 14 01:49 EDT 2021. Contains 342941 sequences. (Running on oeis4.)