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A048537
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a(n) is the smallest value of m such that A002378(m), the m-th oblong number, contains exactly n 4's.
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10
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6, 66, 215, 681, 6681, 12018, 201115, 1531159, 6541784, 21058215, 156340764, 675098840, 5868938806, 6666461193, 120186956049, 586862372693, 1115546688777, 4176295540840, 66589372231193, 66634408865198, 210842150539318, 2108185118566309, 21011769217380159, 185591342591574215, 67412496945629038
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OFFSET
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1,1
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LINKS
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EXAMPLE
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a(2) = 66 since A002378(66) = 4422;
a(3) = 215 since A002378(215) = 46440;
a(4) = 681 since A002378(681) = 464442, etc.
(End).
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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