25708

Appears in sequences

• Numbers k such that k^2 and k^3 have the same set of digits.at n=34A029797
• a(n) = a(n-1) + R(a(n-2)) + R(a(n-3)) where a(0)=a(1)=a(2)=1 and R(k) = A004086(k) is the reverse of k.at n=15A074860
• a(n) is the smallest positive d such that the n-th prime is the smallest prime p for which p+d is also prime.at n=33A101042
• A101042 sorted. There exists a prime p for which a(n) is the smallest positive d such that p is the smallest prime where p+d is also prime.at n=36A101043
• Number of permutations avoiding the patterns {2413,2431,4213,3412,3421,4231,4321,4312}; number of strong sorting class based on 2413.at n=12A111281
• Even numbers k such that if a person is born in year k and lives not more than 100 years, then he never celebrates his prime birthday on a prime year.at n=30A124658
• Compound filter: a(n) = P(sigma(n), sigma(2n)), where P(n,k) is sequence A000027 used as a pairing function, and sigma is the sum of divisors (A000203).at n=48A286359
• Expansion of Product_{k>=1} ((1 - k*x^k)/(1 + k*x^k)).at n=30A292317
• Sum of the largest parts of the partitions of n into 8 squarefree parts.at n=48A326452