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The constant 1.25506 is 30 log 113 / 113 to 5 decimal places, as π(x) log x / x has its maximum value at x = p 30 = 113. [ 30 ] Pierre Dusart proved in 2010: [ 31 ]
For a complete list, see Fifty pence (British decimal coin). Prior to 1997, the two pound coin was minted in commemorative issues only – in 1986, 1989, 1994, 1995 and 1996. Commemorative £2 coins have been regularly issued since 1999, alongside the standard-issue bi-metallic coins which were introduced in 1997.
The United Kingdom slipped into a gold specie standard in 1717 by over-valuing gold at 15 + 1 ⁄ 5 times its weight in silver. It was unique among nations to use gold in conjunction with clipped, underweight silver shillings, addressed only before the end of the 18th century by the acceptance of gold proxies like token silver coins and banknotes.