A359879 a(n) is the index of the smallest tetranacci number (A000078) with exactly n prime factors (counted with multiplicity).

3, 5, 6, 7, 10, 11, 17, 30, 20, 22, 82, 60, 37, 100, 236, 157, 156, 242, 240

Offset

0,1

Comments

a(19) > 400. - Daniel Suteu, Jan 18 2023

Links

Table of n, a(n) for n=0..18.

Eric Weisstein's World of Mathematics, Prime Factor

Eric Weisstein's World of Mathematics, Tetranacci Number

Crossrefs

Cf. A000078, A001222, A072396, A359851, A359877, A359878.

Sequence in context: A067351 A067350 A176651 * A028762 A047328 A028811

Adjacent sequences: A359876 A359877 A359878 * A359880 A359881 A359882

Keyword

nonn,more

Author

Ilya Gutkovskiy, Jan 16 2023

Extensions

a(18) from Daniel Suteu, Jan 18 2023

Status

approved