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Reference.org
Permutable prime
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<p>A permutable prime, also known as anagrammatic prime, is a <a href="/facts/Prime_number/L20FLkgn">prime number</a> which, in a given <a href="/facts/Radix/J5RGWRJF">base</a>, can have its digits' positions switched through any <a href="/facts/Permutation/JSw9ukmv">permutation</a> and still be a prime number. <a href="/facts/H._E._Richert/r5YXgPf1">H. E. Richert</a>, who is supposedly the first to study these primes, called them permutable primes, but later they were also called absolute primes. </p>