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A048438 Concatenation of first n numbers in base 6. 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 (N = 4060073996291), n = 43 (N approx 4.3194 x 10^68), n = 173 (N approx 1.3014 x 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 = 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}] [From 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 * A226199 A267637 A238648

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 May 28 21:38 EDT 2017. Contains 287241 sequences.