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A283670 The single square referenced in A190641 (Numbers having exactly one non-unitary prime factor). 2
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 (list; graph; refs; listen; history; text; internal format)
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 A023405

Adjacent sequences:  A283667 A283668 A283669 * A283671 A283672 A283673

KEYWORD

nonn

AUTHOR

Robert Price, Mar 13 2017

STATUS

approved

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Last modified November 14 23:27 EST 2018. Contains 317221 sequences. (Running on oeis4.)