Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #12 Mar 16 2022 20:13:38
%S 90,992,792990,4992990,199699292,919999892,29939899992,939969999920,
%T 99179499990990,999690999669990,129990929999959950,299899968999993990,
%U 10999489909979999990,299929969229995999992,12999999959999499709890,126994909999399899999990,9399899999156999909995992
%N Smallest oblong (promic) number containing exactly n 9's.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/PronicNumber.html">Pronic Number</a>
%Y Cf. A048547, A002378.
%Y Cf. A048530, A048532, A048534, A048536, A048538, A048540, A048542, A048544, A048546.
%K nonn,base
%O 1,1
%A _Patrick De Geest_, May 15 1999
%E a(13)-a(17) from _Giovanni Resta_, Oct 09 2019