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 A048438 Take the first n numbers written in base 6, concatenate them, then convert from base 6 to base 10. 16
 1, 8, 51, 310, 1865, 67146, 2417263, 87021476, 3132773145, 112779833230, 4060073996291, 146162663866488, 5261855899193581, 189426812370968930, 6819365245354881495, 245497148832775733836, 8837897357979926418113 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS The first three primes in this sequence occur for n = 11 (a(11) = 4060073996291), n = 43 (a(43) =4.3194...*10^68), n = 173 (a(n) = 1.3014...*10^372) (email from Kurt Foster, Oct 24 2015). - N. J. A. Sloane, Oct 25 2015 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..200 EXAMPLE a(8) = (1)(2)(3)(4)(5)(10)(11)(12) = 12345101112_6 = 87021476. MATHEMATICA If[STARTPOINT==1, n={}, n=Flatten[IntegerDigits[Range[STARTPOINT-1], 6]]]; Table[AppendTo[n, IntegerDigits[w, 6]]; n=Flatten[n]; FromDigits[n, 6], {w, STARTPOINT, ENDPOINT}] (* Dylan Hamilton, Aug 11 2010 *) Table[FromDigits[Flatten[IntegerDigits[#, 6]&/@Range[n]], 6], {n, 20}] (* Harvey P. Dale, Sep 29 2012 *) PROG (MAGMA) [n eq 1 select 1 else Self(n-1)*6^(1+Ilog(6, n))+n: n in [1..20]]; // Vincenzo Librandi, Dec 30 2012 CROSSREFS Cf. A014829. Concatenation of first n numbers in other bases: 2: A047778, 3: A048435, 4: A048436, 5: A048437, 6: this sequence, 7: A048439, 8: A048440, 9: A048441, 10: A007908, 11: A048442, 12: A048443, 13: A048444, 14: A048445, 15: A048446, 16: A048447. Sequence in context: A037606 A055147 A014829 * A295602 A226199 A267637 Adjacent sequences:  A048435 A048436 A048437 * A048439 A048440 A048441 KEYWORD nonn,base,easy AUTHOR Patrick De Geest, May 15 1999 STATUS approved

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Last modified February 20 20:08 EST 2020. Contains 332084 sequences. (Running on oeis4.)