688747547

Properties

Appears in sequences

• Smallest k such that 2^^n is not congruent to 2^^(n-1) mod k, where 2^^n denotes the power tower 2^2^...^2 (in which 2 appears n times).at n=19A027763
• Smallest number which when Euler phi function is repeatedly applied have not reached a power of 2 in n steps.at n=18A049117
• Smallest integer k such that the number of iterations of Carmichael lambda function (A002322) needed to reach 1 starting at k (k is counted) is n.at n=20A173927
• Smallest m such that the number of iterations of "take odd part of phi" to reach 1 from m (A227944) is n.at n=19A227946
• Position of first appearance of n in A256757.at n=20A256758
• Prime numbersat n=35700126