

A335883


The least k for which A335884(k) = n.


1



1, 3, 5, 11, 23, 47, 109, 229, 457, 1033, 2161, 4703, 10079, 20663, 43223, 94033, 208849, 420457, 872687, 1849921, 3699841, 8748001, 17496001, 36998411
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OFFSET

0,2


COMMENTS

Because A335884 is fully additive and a(1) = 3, we have a(n) <= 3^n and in particular, a(n+1) <= 3*a(n), n > 0 and more generally a(n + m) <= a(n) * a(m) where m, n >= 0. (See also comments in A334099.)
a(16) = 208849 = 457^2 = a(8)*a(8) is the first composite term.


LINKS

Table of n, a(n) for n=0..23.


FORMULA

For all n >= 0, A335884(a(n)) = n.


CROSSREFS

Cf. A335884.
Sequence in context: A072828 A290114 A032803 * A030494 A246491 A084361
Adjacent sequences: A335880 A335881 A335882 * A335884 A335885 A335886


KEYWORD

nonn,more


AUTHOR

Antti Karttunen, Jun 29 2020


EXTENSIONS

a(21)a(23) from Jinyuan Wang, Jul 08 2020


STATUS

approved



