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2205, 312896925, 1874196225, 3356107425, 4181881725, 4987853325, 6946213725, 8860349025, 13250605725, 17989980525, 25443641025, 32177090925, 38286871425, 55531730925, 75756402225, 113679103725, 152738872209, 170812073025, 179835853725, 186091427025
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OFFSET
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1,1
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COMMENTS
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a(1)=2205=A109510(29), a(2)-a(8) from Max Alekseyev.
sqrt(sigma(a(n))-2*a(n)): 6, 3432, 8250, 11022, 19376.
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LINKS
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PROG
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CROSSREFS
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Cf. A109510 sigma(n)-2n is a square.
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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