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Search: id:A145450
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| 1, 2, 36, 108, 128, 225, 288, 441, 450, 600, 864, 882, 1089, 1176, 1521, 1944, 2000, 2178, 2601, 2904, 3042, 3240, 3249, 4056, 4761, 5202, 6144, 6498, 6561, 6936, 7569, 8649, 8664, 9522, 10000, 11760, 12321, 12696, 13122, 15129, 15138, 16641, 17298
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OFFSET
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1,2
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COMMENT
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Subsequence of A033950.
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EXAMPLE
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36 / A000005(36) = 36 / 9 = 4 = 2^2, hence 36 is in the sequence.
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PROGRAM
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(PARI) {m=18000; for(n=1, m, s=sigma(n, 0); if(n%s==0&&issquare(n/s), print1(n, ", ")))}
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CROSSREFS
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Cf. A000005 (sigma_0, number of divisors of n), A033950 (refactorable numbers), A140480 (RMS numbers).
Sequence in context: A058517 A081310 A069067 this_sequence A134785 A143745 A007757
Adjacent sequences: A145447 A145448 A145449 this_sequence A145451 A145452 A145453
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KEYWORD
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nonn
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AUTHOR
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Ctibor O. Zizka (c.zizka(AT)email.cz), Oct 10 2008
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EXTENSIONS
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Edited and extended. - Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Oct 15 2008
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