A091409 a(n) is the smallest m such that A090822(m) = n.

1, 3, 9, 220

Offset

1,2

Links

Table of n, a(n) for n=1..4.

D. C. Gijswijt, Krulgetallen, Pythagoras, 55ste Jaargang, Nummer 3, Jan 2016. (Shows that the sequence is infinite)

F. J. van de Bult, D. C. Gijswijt, J. P. Linderman, N. J. A. Sloane and Allan Wilks, A Slow-Growing Sequence Defined by an Unusual Recurrence, J. Integer Sequences, Vol. 10 (2007), #07.1.2.

F. J. van de Bult, D. C. Gijswijt, J. P. Linderman, N. J. A. Sloane and Allan Wilks, A Slow-Growing Sequence Defined by an Unusual Recurrence [pdf, ps].

Index entries for sequences related to Gijswijt's sequence

Formula

a(n) is about 2^(2^(3^(4^(5^...^(n-1))))).

Crossrefs

Cf. A090822.

Sequence in context: A062228 A196864 A279834 * A027891 A073889 A332586

Adjacent sequences: A091406 A091407 A091408 * A091410 A091411 A091412

Keyword

nonn

Author

N. J. A. Sloane, based on a suggestion from Dion Gijswijt (gijswijt(AT)science.uva.nl), Mar 04 2004

Extensions

Sequence is infinite but next term, about 10^(10^23.09987) (see A091787), is too large to include.

Status

approved