A212610 - OEIS

%I #20 Feb 27 2013 14:56:19

%S 135,819,3375,6975,25137,40131,68607,154791,22113,448335,557375,

%T 721525,451737,1401543,1278316,1680705,273,2876211,6739509,10590125,

%U 188325,11208375,8775,12525435,9020375,13934375,20365625,56162575,1083537,83479977,3416875

%N Pairs of primitive deficient numbers having the same value of sigma(k)/k, listed by increasing value of the larger of the two k values.

%C "Primitive" means that the pair (a(2n-1),a(n)) = (k,k') is not a multiple of another such pair occurring earlier. - _M. F. Hasler_, Feb 25 2013

%H Donovan Johnson, <a href="/A212610/b212610.txt">Table of n, a(n) for n = 1..48</a>

%F a(2n-1) = A212611(n), a(2n) = A212612(n), for all n>0. - _M. F. Hasler_, Feb 22 2013

%Y Cf. A211680 (non-primitive pairs), A212611, A212612 (the pairs separated).

%K nonn

%O 1,1

%A _T. D. Noe_, May 23 2012

%E a(19)-a(31) from _Donovan Johnson_, May 24 2012