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 A051070 a(n) is the n-th term in sequence A_n, respecting the offset, or a(n) = -1 if A_n has fewer than n terms.. 5
 1, 2, 1, 0, 2, 3, 0, 7, 8, 4, 63, 1, 316, 78, 16, 2048, 7652, 26627, 8, 24000, 232919, 1145406, 3498690007594650042368, 2058537, 58, 26, 27, 59, 9272780, 3, 69273668, 4870847, 2387010102192469724605148123694256128, 1, 1, -53, 43, 0, -4696, 173, 44583, 111111111111111111111111111111111111111111, 30402457, 668803781, 1134903170, 382443020332 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS A value a(n) = -1 could arise in two different ways, but it will be easy to decide which. - N. J. A. Sloane, Nov 27 2016 LINKS N. J. A. Sloane, My favorite integer sequences, in Sequences and their Applications (Proceedings of SETA '98). EXAMPLE a(19) = 8 because A000019(19) = 8. a(20) = 24000 because A000020(20) = 24000. MAPLE for m from 1 do   url:= sprintf("https://oeis.org/A%06d/b%06d.txt", m, m);   S:= URL:-Get(url);   L:= StringTools[Split](S, "\n");   for t in L do     g:= sscanf(t, "%d %d");     if nops(g) = 2 and g[1] = m then       a[m]:= g[2];       break     fi;   od;   if not assigned(a[m]) then break fi; od: seq(a[i], i=1..m-1); # Robert Israel, May 31 2015 CROSSREFS See A091967, A107357, A102288 for other versions. See also A031214, A031135, A037181. Sequence in context: A091967 A031135 A037181 * A104041 A104402 A261897 Adjacent sequences:  A051067 A051068 A051069 * A051071 A051072 A051073 KEYWORD easy,sign AUTHOR Robert G. Wilson v, Aug 23 2000 EXTENSIONS Rechecked and 4 more terms added by N. J. A. Sloane, May 25 2005 a(43) is presently unknown, since A000043(43) is the exponent of the 43rd Mersenne prime. a(44) = 668803781. - N. J. A. Sloane, May 25 2005 a(36) and a(42) corrected and a(43) to a(46) added by Robert Israel, May 31 2015 Definition revised by N. J. A. Sloane, Nov 27 2016 STATUS approved

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Last modified May 21 07:24 EDT 2019. Contains 323441 sequences. (Running on oeis4.)