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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, 1510636363333, 14360440530228, 47140441472504, 149071332733333, 1490343155861166, 4712983368549333, 24955404665166666, 149070527690846966
OFFSET
1,2
LINKS
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).
KEYWORD
nonn,base
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
a(18)-a(25) from Max Alekseyev, Jul 25 2024
STATUS
approved