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Appears in sequences

• a(n+1) is the smallest number > a(n) such that the digits of a(n)^2 are all (with multiplicity) contained in the digits of a(n+1)^2, with a(0)=1.at n=33A014563
• Numbers n such that n*phi(n-1) is a perfect square.at n=29A069069
• Twin prime products minus 2.at n=17A124659
• Let S denote the palindromes in the language {0,1,2,...,n-1}*; a(n) = number of words of length 4 in the language SS.at n=32A187277