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 A048440 Take the first n numbers written in base 8, concatenate them, then convert from base 8 to base 10. 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) = 12345671011_8 = 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 February 20 17:04 EST 2020. Contains 332080 sequences. (Running on oeis4.)