A283670 The single square referenced in A190641 (Numbers having exactly one non-unitary prime factor).

4, 4, 9, 4, 4, 9, 4, 4, 25, 9, 4, 4, 4, 4, 9, 4, 49, 25, 4, 9, 4, 4, 9, 4, 4, 25, 4, 4, 9, 4, 4, 9, 4, 4, 49, 9, 4, 4, 4, 9, 4, 121, 4, 25, 9, 4, 4, 9, 4, 4, 49, 4, 25, 4, 9, 4, 4, 9, 4, 4, 169, 9, 4, 25, 4, 4, 4, 9, 4, 9, 4, 9, 4, 4, 4, 4, 4, 4, 9, 4, 4

Offset

1,1

Links

Robert Price, Table of n, a(n) for n = 1..10000

Example

A190641(4)=12, 12 = 2*2*3, so 12 has only one square factor, namely 4.

Crossrefs

Cf. A190641 A283671.

Sequence in context: A097667 A202388 A283919 * A019627 A137617 A345732

Adjacent sequences: A283667 A283668 A283669 * A283671 A283672 A283673

Keyword

nonn

Author

Robert Price, Mar 13 2017

Status

approved