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 A048331 a(n) in base 6 is a repdigit. 4
 0, 1, 2, 3, 4, 5, 7, 14, 21, 28, 35, 43, 86, 129, 172, 215, 259, 518, 777, 1036, 1295, 1555, 3110, 4665, 6220, 7775, 9331, 18662, 27993, 37324, 46655, 55987, 111974, 167961, 223948, 279935, 335923, 671846, 1007769, 1343692, 1679615, 2015539 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..500 Eric Weisstein's World of Mathematics, Repdigit FORMULA Conjecture: G.f.: x*(1+2*x+3*x^2+4*x^3+5*x^4) / ( (x-1)*(x^4+x^3+x^2+x+1)*(6*x^5-1) ) with a(n) = 7*a(n-5) - 6*a(n-10). - R. J. Mathar, Mar 15 2015 EXAMPLE 14_10 = 22_6, 21_10_ = 33_6, 9331_10_ = 111111_6. MATHEMATICA Union[Flatten[Table[FromDigits[PadRight[{}, n, d], 6], {n, 0, 40}, {d, 5}]]] (* Vincenzo Librandi, Feb 06 2014 *) PROG (MAGMA) [0] cat [k:k in [1..2*10^6]| #Set(Intseq(k, 6)) eq 1]; // Marius A. Burtea, Oct 11 2019 CROSSREFS Cf. A010785, A033019, A028987, A028988. Sequence in context: A029953 A048317 A037398 * A133476 A131023 A069514 Adjacent sequences:  A048328 A048329 A048330 * A048332 A048333 A048334 KEYWORD nonn,base AUTHOR Patrick De Geest, Feb 15 1999 STATUS approved

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Last modified January 22 02:14 EST 2021. Contains 340359 sequences. (Running on oeis4.)