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A048440 Concatenation of first n numbers in base 8. 16
1, 10, 83, 668, 5349, 42798, 342391, 21913032, 1402434057, 89755779658, 5744369898123, 367639673479884, 23528939102712589, 1505852102573605710, 96374534564710765455, 6167970212141488989136, 394750093577055295304721 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

83 is the only prime in this sequence among the first 3000 terms (email from Kurt Foster, Oct 24 2015). - N. J. A. Sloane, Oct 25 2015

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..390

EXAMPLE

a(9) = 1 2 3 4 5 6 7 10 11 = 1402434057

MATHEMATICA

If[STARTPOINT==1, n={}, n=Flatten[IntegerDigits[Range[STARTPOINT-1], 8]]]; Table[AppendTo[n, IntegerDigits[w, 8]]; n=Flatten[n]; FromDigits[n, 8], {w, STARTPOINT, ENDPOINT}] [Dylan Hamilton, Aug 11 2010]

Table[FromDigits[Flatten[IntegerDigits[#, 8]&/@Range[n]], 8], {n, 20}] (* Harvey P. Dale, Dec 07 2012 *)

PROG

(MAGMA) [n eq 1 select 1 else Self(n-1)*8^(1+Ilog(8, n))+n: n in [1..20]]; // Vincenzo Librandi, Dec 30 2012

CROSSREFS

Cf. A014831.

Concatenation of first n numbers in other bases: 2: A047778, 3: A048435, 4: A048436, 5: A048437, 6: A048438, 7: A048439, 8: this sequence, 9: A048441, 10: A007908, 11: A048442, 12: A048443, 13: A048444, 14: A048445, 15: A048446, 16: A048447.

Sequence in context: A037608 A055149 A014831 * A226202 A271557 A267031

Adjacent sequences:  A048437 A048438 A048439 * A048441 A048442 A048443

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.