7207201

Appears in sequences

• a(n) is the least multiple of n such that a(n) = 1 mod k for all integers k with 1 < k < n and k relatively prime to n.at n=16A055006
• a(n) is smallest positive integer multiple of n-th prime, say k*prime(n), such that k*prime(n) == 1 (mod j) for each integer j with 1 < j < prime(n).at n=6A094998
• a(n) is the largest Carmichael number of the form prime(n)*prime(n')*prime(n") with n < n' < n", or 0 if no such number exists.at n=6A141706
• The first number that is (at least) n-fold intrinsically 3-palindromic (represented in base ten).at n=21A171702
• Carmichael numbers (A002997) that are the sum of two squares.at n=27A265237
• a(n) is the smallest integer with at least n palindromic representations of length >= 3 in bases b >= 2.at n=21A275220
• The largest 3-Carmichael number that is divisible by the n-th odd prime.at n=5A290485
• Carmichael numbers k for which A053575(k) [the odd part of phi] divides k-1.at n=15A339869
• Carmichael numbers k such that k-1 is a Novak-Carmichael number.at n=17A375322