A048540 - OEIS

%I #13 Feb 16 2025 08:32:40

%S 56,552,5550,5055752,5255556,552555542,2555555256,551555015556,

%T 5555555065506,515605555595550,5558455555057550,495553555055055552,

%U 555055556595557556,15975555555558555452,5525459555405553555552,59555925551555575555056,255555555455525595515520

%N Smallest oblong (promic) number containing exactly n 5's.

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

%Y Cf. A048539, A002378.

%Y Cf. A048530, A048532, A048534, A048536, A048538, A048542, A048544, A048546, A048548.

%K nonn,base

%O 1,1

%A _Patrick De Geest_, May 15 1999

%E a(14)-a(17) from _Giovanni Resta_, Oct 09 2019