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Search: id:A048674
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OFFSET
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1,2
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COMMENT
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Factorization: 1, 2, 3, 5^2, 2*13, 3*11, 3*31, 2*11*47, 5^2*197^2, 2*11*47*8269
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EXAMPLE
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E.g. 26=2*13=((3*17)+1)/2
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MAPLE
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factsuccbijection := n -> floor((succfactorization(n)+1)/2); # see also A045965
# Invariant Factorization Successors: invariant_factsuccessors := proc(upto_n) local b, i; b := [ ]; for i from 1 to upto_n do if(factsuccbijection(i) = i) then b := [ op(b), i ]; fi; od: RETURN(b); end;
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CROSSREFS
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Cf. A045965 and A048673.
Adjacent sequences: A048671 A048672 A048673 this_sequence A048675 A048676 A048677
Sequence in context: A003221 A013312 A013318 this_sequence A094998 A109586 A060371
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KEYWORD
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nonn,hard
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AUTHOR
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Antti Karttunen, Jul 14 1999
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