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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: A034563 A242496 A356684 * 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 May 23 09:12 EDT 2024. Contains 372760 sequences. (Running on oeis4.)