|

楼主 |
发表于 2022-3-21 15:58
|
显示全部楼层
本帖最后由 yangchuanju 于 2022-3-26 04:52 编辑
奇葩的平方数5
A102567给出500位以内的1098个“自己+自己”是平方数的正整数,A106497给出对应的500位以内的1098个“自己+自己”是平方数的平方根数。请查阅。涉及素数7,11,13,17,19,23,29,73,101,487的各种循环节及合成数77,91,143,253的各种循环节。
A106498 Numbers k such that the concatenation of k with itself自己 is a biperiod双周期 square.
13223140496, 20661157025, 29752066116, 40495867769, 52892561984, 66942148761, 82644628100, 183673469387755102041, 326530612244897959184, 510204081632653061225, 734693877551020408164
A106497 Numbers whose square is the concatenation of two identical numbers, i.e., of the form NN.
36363636364, 45454545455, 54545454546, 63636363637, 72727272728, 81818181819, 90909090910, 428571428571428571429, 571428571428571428572, 714285714285714285715, 857142857142857142858
|
|