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A157466号
小于等于n的数字的数量,在十进制表示中最多插入一个数字时为正方形(参见A157465号).
4
1, 2, 3, 4, 5, 6, 7, 7, 8, 9, 10, 11, 12, 12, 13, 13, 14, 14, 14, 15, 15, 16, 17, 17, 18, 19, 20, 20, 21, 22, 22, 23, 24, 24, 25, 25, 26, 26, 26, 26, 27, 28, 28, 28, 29, 29, 29, 29, 30, 31, 31, 31, 32, 32, 32, 32, 33, 34, 34, 35, 35, 36, 37, 37, 38, 39, 40, 41, 41, 42, 42, 42, 43
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0,2
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n≤131时,a(n)>n/2;
a(n)<=n/2,对于n>131;
a(n)<=a(n+1);对于n-->oo,a(n)/n-->0;
一个(A157465号(n+1))=a(A157465号(n) )+1。
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基础,非n
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经核准的