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A232554 Square numbers whose sum of square divisors is also square. 3
1, 1764, 60516, 82369, 529984, 2056356, 2798929, 3534400, 18181696, 38900169, 96020401, 97121025, 335988900, 455907904, 457318225, 617820736, 1334513961, 1599200100, 2176689025, 3279852900, 4464244225, 8586616896, 15688815025, 24514164900, 33366502225 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..25.

FORMULA

a(n) = A046655(n)^2.

EXAMPLE

60516=246^2. Sum of square divisors: 60516+15129+6724+1681+36+9+4+1=84100=290^2.

PROG

(PARI){for(n=1, 10^5, m=n*n; k=sumdiv(m, d, d*issquare(d)); if(issquare(k), print(m)))}

CROSSREFS

Cf. A046655, A232555, A232556, A232557.

Sequence in context: A237781 A205904 A061627 * A111886 A031762 A031630

Adjacent sequences:  A232551 A232552 A232553 * A232555 A232556 A232557

KEYWORD

nonn

AUTHOR

Antonio Roldán, Nov 26 2013

STATUS

approved

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Last modified September 23 06:51 EDT 2018. Contains 315273 sequences. (Running on oeis4.)