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 A180202 The product of the two numbers in an amicable pair, A002025(n) * A002046(n). 4
 62480, 1432640, 7660880, 27931280, 39685376, 116636864, 179299575, 318523136, 4794813680, 4483640576, 4773473775, 6100571295, 7076217500, 12475715175, 17094480975, 15069863936, 21699524864, 24011966300, 30304399616 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS This sequence initially shares many terms with A180163 because small amicable pairs are sometimes consecutive terms in the sorted list of amicable numbers, A063990. First differs from A180163 at a(9). - Omar E. Pol, Oct 25 2017 LINKS Amiram Eldar, Table of n, a(n) for n = 1..10000 (terms 1..1000 from T. D. Noe) FORMULA a(n) = A259180(2n-1) * A259180(2n). - Omar E. Pol, Oct 22 2017 EXAMPLE a(9) = A002025(9) * A002046(9) = 63020 * 76084 = 4794813680. MATHEMATICA s[n_] := DivisorSigma[1, n]-n; smallAmicableQ[n_] := Module[{b=s[n]}, n

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Last modified June 8 00:26 EDT 2023. Contains 363157 sequences. (Running on oeis4.)