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 A179075 Concatenation of the first n numbers in base n. 0
 6, 48, 436, 4855, 67146, 1120882, 21913032, 490328973, 12345678910, 345227121316, 10610896401084, 355457590375459, 12887297856859986, 502684312937210790, 20988295479420645136, 933876701895122362393, 44111544001370512713990, 2204350295349917301461848 (list; graph; refs; listen; history; text; internal format)
 OFFSET 2,1 COMMENTS Always divisible by n, hence never prime. LINKS FORMULA a(n) = n + sum(i*(n^(n+1-i)), i=1..n-1). EXAMPLE a(2) = 110 (base 2) = 6 (base 10) = A047778(2). a(3) = 1210 (base 3) = 48 (base 10) = A048435(3). a(4) = 12310 (base 4) = 436 (base 10) = A048436(4). a(5) = 123410 (base 5) = 4855 (base 10) = A048437(5). a(11) = 123456789A10 (base 11) = 345227121316 (base 10). a(16) = 123456789ABCDE10 (base 16) = 20988295479420645136 (base 10) = A048447(16). PROG (PARI) {for(n=2, 19, tlt=0; for(i=1, n-1, tlt=tlt+i*(n^(n+1-i))); print1(tlt+n, ", ") )} \\ Douglas Latimer, May 10 2012 CROSSREFS Cf. A047778, A048435-A048447, A179069. Sequence in context: A345077 A244038 A037184 * A175916 A231104 A085457 Adjacent sequences:  A179072 A179073 A179074 * A179076 A179077 A179078 KEYWORD easy,nonn,base AUTHOR Jonathan Vos Post, Jun 27 2010 EXTENSIONS Edited (errors corrected, sequence extended) by Jon E. Schoenfield, Jul 05 2010 and Jul 06 2010 More terms from Douglas Latimer, May 10 2012 STATUS approved

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Last modified December 5 04:10 EST 2021. Contains 349530 sequences. (Running on oeis4.)