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A073873
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Terms of A073872 that do not change their position in the rearrangement; i.e., values of A073872(n) which equal n(n+1)/2.
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2
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1, 45, 325, 1225, 1653, 2145, 3321, 3655, 4371, 7381, 8911, 11781, 14365, 17205, 20301, 21945, 23653, 25425, 32131, 34191, 41905, 44253, 45451, 46665, 47895, 54285, 55611, 59685, 65341, 68265, 72771, 74305, 77421, 87153, 97461, 110215
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OFFSET
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1,2
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COMMENTS
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Is n^2*(n^2+1)/2 in the sequence for infinitely many odd numbers n? For almost all odd n? It's in the sequence for n up to 99, except for 39, 65 and 67.
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LINKS
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CROSSREFS
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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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