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Search: id:A111227
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| 3, 11, 29, 53, 58, 59, 67, 101, 109, 131, 149, 173, 202, 239, 461, 479, 659, 1031, 1319, 1579, 1847
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OFFSET
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1,1
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COMMENT
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A number n is called (m,k)-perfect if sigma^m(n) = k*n. A019294(n) gives minimal values of m for n. a(n) are the values where A019294(n) > n.
Corresponding values of m and k are in A111726, A111727.
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REFERENCES
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Graeme L. Cohen and Herman J. J. te Riele, Iterating the sum-of-divisors function, Experimental Mathematics, 5 (1996), pp. 94.
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LINKS
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Experimental Mathematics, 5 (1996)
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CROSSREFS
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Sequence in context: A092781 A018743 A077279 this_sequence A111693 A100032 A069350
Adjacent sequences: A111224 A111225 A111226 this_sequence A111228 A111229 A111230
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KEYWORD
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hard,nonn
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AUTHOR
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Lambert Klasen (lambert.klasen(AT)gmx.net), Oct 26 2005
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