翻訳と辞書 |
138 (number) : ウィキペディア英語版 | 138 (number)
138 (one hundred () thirty-eight) is the natural number following 137 and preceding 139. ==In mathematics== 138 is a sphenic number, the sum of four consecutive primes (29 + 31 + 37 + 41), and the smallest product of 3 primes, such that in base 10, the third prime is a concatenation of the other two: . 138 is the third 47-gonal number and an Ulam number,〔(A002858 in the OEIS )〕 as well as a 1 step palindrome (138 + 831 = 969.) 138 is the 72nd normal Congruent number 〔(in the OEIS )〕 and the 49th primitive or square free congruent number.〔(in the OEIS )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「138 (number)」の詳細全文を読む
スポンサード リンク
翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|