A361328 a(n) is the least prime factor of A361321(n) with a(1) = 1.

1, 2, 2, 5, 3, 3, 2, 2, 7, 3, 3, 5, 7, 2, 2, 5, 5, 2, 2, 3, 3, 7, 2, 2, 3, 7, 7, 5, 2, 2, 13, 11, 2, 2, 5, 3, 2, 2, 5, 5, 2, 2, 5, 3, 3, 7, 2, 2, 3, 3, 7, 2, 2, 3, 3, 7, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 11, 2, 2, 11, 11, 2, 2, 13, 13, 2, 2, 3, 3, 5, 7, 2, 2, 3, 5, 5

Offset

1,2

Links

Scott R. Shannon, Table of n, a(n) for n = 1..10000

Example

A361321(3) = 10 = 2*5, so a(3) = 2.

Crossrefs

Cf. A361321, A000469, A361327 (greatest prime factor), A361329, A361329, A336957, A360519, A361119.

Sequence in context: A157495 A308143 A308515 * A128134 A157223 A174608

Adjacent sequences: A361325 A361326 A361327 * A361329 A361330 A361331

Keyword

nonn

Author

Scott R. Shannon, Rémy Sigrist and N. J. A. Sloane, Mar 15 2023

Status

approved