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A232556 Numbers whose sum of proper square divisors is a square greater than 1. 3
900, 3528, 4900, 5292, 8820, 10404, 10584, 12348, 17640, 19404, 22932, 24696, 26460, 29988, 33516, 37044, 38808, 40572, 45864, 51156, 52920, 54684, 58212, 59976, 61740, 65268, 67032, 68796, 72324, 74088, 75852, 79524, 81144, 81796, 82908, 89964, 93492 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Supersequence of A232555 and A232557.

LINKS

Table of n, a(n) for n=1..37.

EXAMPLE

Sum of proper square divisors of 5292: 1764+441+196+49+36+9+4+1 = 2500 = 50^2 is square number.

PROG

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

CROSSREFS

Cf. A232554, A232555, A232557.

Sequence in context: A258888 A287800 A246887 * A069096 A232557 A119541

Adjacent sequences:  A232553 A232554 A232555 * A232557 A232558 A232559

KEYWORD

nonn

AUTHOR

Antonio Roldán, Nov 26 2013

STATUS

approved

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Last modified November 15 04:00 EST 2018. Contains 317225 sequences. (Running on oeis4.)