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A045972 a(1)=9; if n = Product p_i^e_i, n > 1, then a(n) = Product p_{i+2}^{e_i+1}. 0
9, 25, 49, 125, 121, 1225, 169, 625, 343, 3025, 289, 6125, 361, 4225, 5929, 3125, 529, 8575, 841, 15125, 8281, 7225, 961, 30625, 1331, 9025, 2401, 21125, 1369, 148225, 1681, 15625, 14161, 13225, 20449, 42875, 1849, 21025, 17689, 75625, 2209, 207025 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

From a puzzle proposed by Marc LeBrun.

LINKS

Table of n, a(n) for n=1..42.

CROSSREFS

Sequence in context: A110588 A282631 A245694 * A297596 A266132 A112629

Adjacent sequences:  A045969 A045970 A045971 * A045973 A045974 A045975

KEYWORD

easy,nonn

AUTHOR

N. J. A. Sloane

EXTENSIONS

More terms from David W. Wilson

STATUS

approved

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Last modified July 31 03:56 EDT 2021. Contains 346367 sequences. (Running on oeis4.)