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A048545 a(n) is the smallest value of m such that A002378(m), the m-th oblong number, contains exactly n 8's. 10

%I #22 Jul 25 2024 13:59:03

%S 13,113,886,2861,9213,93855,298053,1359738,2967970,26189480,220183761,

%T 433461519,3462498821,28962801813,43462498821,722411301260,

%U 942809540088,9049247973113,29354537778480,195230348268113,1970200215432144,2426703296418144,2233582298883761,93802389568778480,242669917148548480

%N a(n) is the smallest value of m such that A002378(m), the m-th oblong number, contains exactly n 8's.

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

%e From _Jesse Sealand_, Oct 07 2019: (Start)

%e a(1) = 13 since A002378(13) = 182;

%e a(2) = 113 since A002378(113) = 12882;

%e a(3) = 886 since A002378(886) = 785882;

%e a(4) = 2861 since A002378(2861) = 8188182, etc.

%e (End).

%Y Cf. A048546, A002378.

%Y Cf. A048529, A048531, A048533, A048535, A048537, A048539, A048541, A048543, A048547.

%K nonn,base

%O 1,1

%A _Patrick De Geest_, May 15 1999

%E a(13)-a(16) from _Lars Blomberg_, Jun 10 2011

%E Name edited by _Jesse Sealand_, Oct 07 2019

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

%E a(18)-a(25) from _Max Alekseyev_, Jul 25 2024

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Last modified September 16 18:59 EDT 2024. Contains 375977 sequences. (Running on oeis4.)