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Ulam numbers u such that 5*u is also an Ulam number.
1

%I #18 Jul 01 2017 07:48:40

%S 36,97,138,206,358,402,722,2816,3205,3725,3918,3962,5020,5516,7461,

%T 8368,8756,9193,9621,10247,11219,11586,11759,12365,12580,12602,13164,

%U 13401,14892,15820,17743,18305,19644,20140,22344,24785,29733,32626,33276,34549,34615,35888

%N Ulam numbers u such that 5*u is also an Ulam number.

%C As in the case k=2, these are very scarce Ulam numbers u with the property that k*u is also an Ulam number (see link).

%H Enrique Navarrete, <a href="/A287613/a287613.pdf">Relative Frequencies of Multiples of Ulam Numbers</a>

%Y Cf. A002858, A068791, A285885, A287612.

%K nonn

%O 1,1

%A _Enrique Navarrete_, May 27 2017