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

Author

N. J. A. Sloane, May 25 2005

Keywords

• sign

Comments

What is a(107357)?

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

Links

• 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).

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