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

13, 113, 886, 2861, 9213, 93855, 298053, 1359738, 2967970, 26189480, 220183761, 433461519, 3462498821, 28962801813, 43462498821, 722411301260, 942809540088, 9049247973113, 29354537778480, 195230348268113, 1970200215432144, 2426703296418144, 2233582298883761, 93802389568778480, 242669917148548480

Offset

1,1

Links

Table of n, a(n) for n=1..25.

Eric Weisstein's World of Mathematics, Pronic Number

Example

From Jesse Sealand, Oct 07 2019: (Start)
a(1) = 13 since A002378(13) = 182;
a(2) = 113 since A002378(113) = 12882;
a(3) = 886 since A002378(886) = 785882;
a(4) = 2861 since A002378(2861) = 8188182, etc.
(End).

Crossrefs

Cf. A048546, A002378.

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

Sequence in context: A196862 A021076 A125376 * A164609 A055430 A095680

Adjacent sequences: A048542 A048543 A048544 * A048546 A048547 A048548

Keyword

nonn,base

Author

Patrick De Geest, May 15 1999

Extensions

a(13)-a(16) from Lars Blomberg, Jun 10 2011

Name edited by Jesse Sealand, Oct 07 2019

a(17) from Giovanni Resta, Oct 09 2019

a(18)-a(25) from Max Alekseyev, Jul 25 2024

Status

approved