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 A266000 Numbers n such that the symmetric representation of sigma(n) has at least two parts of distinct size. 1
 9, 21, 25, 27, 33, 35, 39, 45, 49, 50, 51, 55, 57, 63, 65, 69, 70, 75, 77, 81, 85, 87, 91, 93, 95, 98, 99, 105, 110, 111, 115, 117, 119, 121, 123, 125 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS In other words: numbers n such that the symmetric representation of sigma(n) has at least two parts with distinct number of cells. For more information about the symmetric representation of sigma see A237270 and A237593. LINKS Table of n, a(n) for n=1..36. EXAMPLE The symmetric representation of sigma(9) = 13 in the first quadrant looks like this: y . ._ _ _ _ _ 5 |_ _ _ _ _| . |_ _ 3 . |_ | . |_|_ _ 5 . | | . | | . | | . | | . . . . . . . . |_| . . x . There are three parts: 5 + 3 + 5 = 13, so 9 is in the sequence because the structure contains at least two parts of distinct size. CROSSREFS Complement of A265999. Cf. A000203, A196020, A235791, A236104, A237270, A237271, A237591, A237593, A239660, A239931-A239934, A245092, A262626. Sequence in context: A111171 A317789 A333039 * A067887 A345330 A174870 Adjacent sequences: A265997 A265998 A265999 * A266001 A266002 A266003 KEYWORD nonn,more AUTHOR Omar E. Pol, Dec 19 2015 STATUS approved

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Last modified September 7 07:38 EDT 2024. Contains 375729 sequences. (Running on oeis4.)