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Happy amicable pairs: numbers which belong to an amicable pair in which both terms are happy numbers.
1

%I #11 Sep 29 2020 04:21:43

%S 10572550,10854650,32685250,34538270,35361326,40117714,35390008,

%T 39259592,186878110,196323170,242126704,257841296,250876395,323303445,

%U 300208696,313576904,388904355,465418845,395939775,499717185,541114808

%N Happy amicable pairs: numbers which belong to an amicable pair in which both terms are happy numbers.

%C In first 5000 Amicable pairs, there are 111 happy amicable numbers.

%H Amiram Eldar, <a href="/A066870/b066870.txt">Table of n, a(n) for n = 1..20000</a>

%H Shyam Sunder Gupta, <a href="http://www.shyamsundergupta.com/amicable.htm">Amicable Numbers</a>.

%e a(1) = 10572550 and a(2) = 10854650, where a(1) and a(2) are happy numbers and also (10572550, 10854650) is an amicable pair.

%Y Cf. A063990, A007770.

%K nonn,base

%O 1,1

%A _Shyam Sunder Gupta_, Jan 21 2002