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A085255 Numbers having a at least two representations as sum of two powerful numbers (A001694). 4

%I

%S 17,33,36,40,41,50,52,57,65,68,72,73,76,80,81,85,89,97,104,108,109,

%T 113,116,117,125,129,130,132,133,136,137,144,145,148,152,153,157,160,

%U 164,170,172,177,180,185,189,193,197,200,201,204,205,208,209,216,221

%N Numbers having a at least two representations as sum of two powerful numbers (A001694).

%C A085252(a(n))>1.

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/PowerfulNumber.html">Powerful Number</a>

%Y Cf. A085254, A076871, A085253.

%K nonn

%O 1,1

%A _Reinhard Zumkeller_, Jun 23 2003

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Last modified January 26 10:40 EST 2020. Contains 331279 sequences. (Running on oeis4.)