25670807

Appears in sequences

• Successive approximations to 5-adic integer sqrt(-1).at n=10A034935
• One of the two successive approximations up to 5^n for the 5-adic integer sqrt(-1).at n=11A048898
• Smallest integer m such that m^2 + 1 has exactly n prime factors, counted with multiplicity.at n=13A257366
• a(n) is the unique odd-valued residue modulo 5^n of a number m such that m^2+1 is divisible by 5^n.at n=10A259266