A page of the Numeropedia - the Special Encyclopedia of Numbers
[Calendar] The number of leap years in a period of 400 years, following the adoption of the current Gregorian calendar, created by Pope Gregory XIII in 1582 to reform the old Julian calendar.
[Chemistry] The atomic number of Berkelium (Bk). An element in the Actinide series: Actinium (89) to Lawrencium (103).
[Math.] The largest 2-digit prime number. An absolute prime number (or permutable prime number): both numbers 97 and 79 are prime numbers or in fact, absolute prime numbers.
[Math.] A 6-term arithmetic progression of prime numbers, of common difference 30: 7, 37, 67, 97, 127 and 157.
[Math.] (Sequence of numbers (10n–3), n > 1).
973 = 912,673 = (91+2–6+7+3)3.
[Math.] 9710 = 73,742,412,689,492,826,049 =
[Math.] 97,779,977 = 97×1,008,041.
[Money] U.S. penny is currently made of 97.5% zinc and 2.5% copper, (since 1982).