

A048533


a(n) is the smallest value of m such that A002378(m), the mth oblong number, contains exactly n 2's.


10



1, 16, 141, 458, 1458, 10593, 36458, 471933, 471404, 3496458, 14930593, 149072541, 471446966, 149071198, 14907133333, 114989226548, 471404524016
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OFFSET

1,2


LINKS

Table of n, a(n) for n=1..17.
Eric Weisstein's World of Mathematics, Pronic Number


EXAMPLE

From Jesse Sealand, Oct 06 2019: (Start)
a(1) = 1 since A002378(1) = 2;
a(2) = 16 since A002378(16) = 272;
a(3) = 141 since A002378(141) = 20022;
a(4) = 458 since A002378(458) = 210222, etc.
(End).


CROSSREFS

Cf. A048534, A002378.
Cf. A048529, A048531, A048535, A048537, A048539, A048541, A048543, A048545, A048547.
Sequence in context: A300878 A301488 A232311 * A303145 A213349 A336239
Adjacent sequences: A048530 A048531 A048532 * A048534 A048535 A048536


KEYWORD

nonn,base,more


AUTHOR

Patrick De Geest, May 15 1999


EXTENSIONS

a(15)a(16) from Lars Blomberg, Jun 10 2011
Name edited by Jesse Sealand, Oct 06 2019
a(17) from Giovanni Resta, Oct 09 2019


STATUS

approved



