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A048533 a(n) is the smallest value of m such that A002378(m), the m-th 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 (list; graph; refs; listen; history; text; internal format)
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 A032444

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

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Last modified November 19 22:34 EST 2019. Contains 329323 sequences. (Running on oeis4.)