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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

Table of n, a(n) for n=1..46.

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 February 23 09:28 EST 2018. Contains 299508 sequences. (Running on oeis4.)