The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A329188 Odd unitary admirable numbers: the odd terms of A328328. 4
 80535, 354585, 403095, 430815, 437745, 442365, 5388495, 6126645, 9338595, 36340395, 130689195, 747242265, 1335049485, 2224695165, 4085490255, 9665740455, 10394173335, 11534750535, 13837748925, 33378237165, 73088757105, 94849396005, 109544822205, 216654032595 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Of the first 10^4 unitary admirable numbers only 6 are odd. a(21) > 6*10^10. LINKS Giovanni Resta, Table of n, a(n) for n = 1..43 (terms < 10^13) MATHEMATICA usigma[1] = 1; usigma[n_] := Times @@ (1 + Power @@@ FactorInteger[n]); uadmQ[n_] := (ab = usigma[n] - 2 n) > 0 && EvenQ[ab] && ab/2 < n && Divisible[n, ab/2] && CoprimeQ[2*n/ab, ab/2]; s = {}; Do[If[uadmQ[n], AppendTo[s, n]], {n, 1, 10^6, 2}]; s CROSSREFS The unitary version of A109729. Intersection of A005408 and A328328. Subsequence of A129485. Sequence in context: A218248 A102457 A102459 * A095946 A264805 A050517 Adjacent sequences:  A329185 A329186 A329187 * A329189 A329190 A329191 KEYWORD nonn AUTHOR Amiram Eldar, Nov 07 2019 EXTENSIONS Data corrected by Amiram Eldar, May 12 2020 Terms a(21) and beyond from Giovanni Resta, May 12 2020 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified July 31 02:33 EDT 2021. Contains 346367 sequences. (Running on oeis4.)