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%I #13 Jul 18 2021 06:46:58
%S 39,57,32262231,67737765,79321055,3341093417798787499092,
%T 3861488851737861033960,4747922651210186579786,5252077348789813420210,
%U 6138511148262138966036,6658906582201212500904,7232275368591793618230
%N Numbers k such that k*(k+5) gives the concatenation of two numbers m and m-1.
%e 79321055 * 79321060 = 62918301//62918300, where // denotes concatenation.
%Y Cf. A028557, A116112, A116276, A116280, A116282, A116289.
%K nonn,base
%O 1,1
%A _Giovanni Resta_, Feb 06 2006
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