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A048539 a(n) is the smallest value of m such that A002378(m), the m-th oblong number, contains exactly n 5's. 10
7, 23, 74, 2248, 2292, 23506, 50552, 742667, 2357022, 22706949, 74555050, 703955648, 745020507, 3996943276, 74333434976, 244040827632, 505525029504 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..17.

Eric Weisstein's World of Mathematics, Pronic Number

CROSSREFS

Cf. A048540, A002378.

Cf. A048529, A048531, A048533, A048535, A048537, A048541, A048543, A048545, A048547.

Sequence in context: A002223 A034563 A242496 * A240526 A018886 A145842

Adjacent sequences:  A048536 A048537 A048538 * A048540 A048541 A048542

KEYWORD

nonn,base,more

AUTHOR

Patrick De Geest, May 15 1999

EXTENSIONS

a(14)-a(16) from Lars Blomberg, Jun 10 2011

a(17) added and name edited by Giovanni Resta, Oct 09 2019

STATUS

approved

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Last modified April 12 03:14 EDT 2021. Contains 342912 sequences. (Running on oeis4.)