The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A348606 Numbers k such that k and k+1 are both nonexponential abundant numbers. 1
 21735, 76544, 170624, 301664, 345344, 348704, 382304, 739935, 862784, 1218944, 1262624, 1272704, 1314495, 1370655, 1376864, 1539615, 1558304, 1707615, 1718144, 1761375, 1845375, 1890944, 1926015, 2100735, 2132864, 2223584, 2415104, 2463615, 2581215, 2675295, 2747744 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Amiram Eldar, Table of n, a(n) for n = 1..10000 EXAMPLE 21735 is a term since A160135(21735) = 21930 > 21735 and A160135(21736) = 23230 > 21736. MATHEMATICA esigma[n_] := Times @@ (Sum[First[#]^d, {d, Divisors[Last[#]]}] &) /@ FactorInteger[n]; q[n_] := DivisorSigma[1, n] - esigma[n] > n; Select[Range[1, 3*10^6], q[#] && q[#+1] &] CROSSREFS Cf. A160135. Subsequence of A096399 and A348604. Similar sequences: A318167, A327635, A327942, A331412, A348276. Sequence in context: A318167 A327635 A274807 * A185863 A265614 A265139 Adjacent sequences: A348603 A348604 A348605 * A348607 A348608 A348609 KEYWORD nonn AUTHOR Amiram Eldar, Oct 25 2021 STATUS approved

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

Last modified September 29 16:58 EDT 2023. Contains 365773 sequences. (Running on oeis4.)