A107357 a(n) = 1 + A_n(n), or a(n) = -1 if sequence A_n is not defined up to index n.

2, 3, 2, 1, 3, 4, 1, 8, 9, 5, 64, 2, 317, 79, 17, 2049, 7653, 26628, 9, 24001, 232920, 1145407, 3498690007594650042369, 2058538, 59, 27, 28, 60, 9272781, 4, 69273669, 4870848, 2387010102192469724605148123694256129, 2, 2, -52, 44, 1, -4695, 174, 44584, 111111111111111111111111111111111111111112, 30402458, 668803782, 1134903171, 382443020333

Offset

1,1

Comments

What is a(107357)?

See A051070, A091967, A102288 for more about this type of sequence.

Links

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

N. J. A. Sloane, "A Handbook of Integer Sequences" Fifty Years Later, arXiv:2301.03149 [math.NT], 2023, p. 21.

Index entries for sequences whose definition involves A_n (or An).

Crossrefs

a(n) = A051070(n) + 1 (except when A_n has fewer than n terms). See also A091967 and A102288 (the same but ignoring the offset).

Sequence in context: A139367 A117648 A037222 * A251718 A182457 A368605

Adjacent sequences: A107354 A107355 A107356 * A107358 A107359 A107360

Keyword

sign

Author

N. J. A. Sloane, May 25 2005

Extensions

Definition revised by N. J. A. Sloane, Nov 27 2016

Definition rephrased by M. F. Hasler, Jan 20 2017

Corrected a(36) and a(42), extended to a(46) by M. F. Hasler, Jan 21 2017

Status

approved