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Seventy-nine is the natural number following 78 and preceding 80. ==In mathematics== *An odd number *The smallest number that can't be represented as a sum of fewer than 19 fourth powers *A strictly non-palindromic number *The 22nd prime number (the next is 83) *The smallest prime number ''p'' for which the real quadratic field Q() has class number greater than 1 (namely 3)〔H. Cohen, ''A Course in Computational Algebraic Number Theory'', GTM 138, Springer Verlag (1993), Appendix B2, p.507. The table lists fields by discriminant, which is 4''p'' for Q() when ''p'' is congruent to 3 modulo 4, as is the case for 79, so the entry appears at discriminant 316.〕 *A cousin prime with 83 *An emirp, because the reverse of 79, 97, is also a prime *A fortunate prime *A prime number that is also a Gaussian prime (since it is of the form ) *A happy prime *A Higgs prime *A Kynea prime () *A lucky prime *A permutable prime, with ninety-seven *A Pillai prime, because 23! + 1 is divisible by 79, but 79 is not one more than a multiple of 23 *A regular prime *A prime in a residue classes 4n+3, 8n+7, and 10n+9 *A right-truncatable prime, because when the last digit (9) is removed, the remaining number (7) is still prime *A sexy prime (with 73) *The ''n'' value of the Wagstaff prime 201487636602438195784363 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「79 (number)」の詳細全文を読む スポンサード リンク
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