A088377 (Smallest prime-factor of n)^2.

1, 4, 9, 4, 25, 4, 49, 4, 9, 4, 121, 4, 169, 4, 9, 4, 289, 4, 361, 4, 9, 4, 529, 4, 25, 4, 9, 4, 841, 4, 961, 4, 9, 4, 25, 4, 1369, 4, 9, 4, 1681, 4, 1849, 4, 9, 4, 2209, 4, 49, 4, 9, 4, 2809, 4, 25, 4, 9, 4, 3481, 4, 3721, 4, 9, 4, 25, 4, 4489, 4, 9, 4, 5041, 4, 5329, 4, 9, 4

Offset

1,2

Comments

a(n) = A000290(A020639(n)).

Links

Table of n, a(n) for n=1..76.

Eric Weisstein's World of Mathematics, Least Prime Factor

Eric Weisstein's World of Mathematics, Square Number

Crossrefs

Cf. A088378, A088379.

Cf. A068319.

Cf. A247180.

Sequence in context: A361400 A291645 A340769 * A066048 A103164 A210966

Adjacent sequences: A088374 A088375 A088376 * A088378 A088379 A088380

Keyword

nonn

Author

Reinhard Zumkeller, Sep 28 2003

Status

approved