4463641

Appears in sequences

• Absolute Euler pseudoprimes: odd composite numbers n such that a^((n-1)/2) == +-1 (mod n) for every a coprime to n.at n=29A033181
• Carmichael numbers of the form C = (30n-p)*(60n-(2p+1))*(90n-(3p+2)), where n is a natural number and p, 2p+1, 3p+2 are all three prime numbers.at n=4A182087
• Carmichael numbers of the form C = p*(2p-1)*(n*(2p-2)+p), where p and 2p-1 are prime numbers.at n=24A182207
• Carmichael numbers divisible by 7.at n=21A182208
• Carmichael numbers of the form (6*k+1)*(12*k+1)*(18*k+1) which are the product of four prime numbers.at n=2A221742
• Carmichael numbers of the form (6*k + 1)*(12*k + 1)*(18*k + 1), where only two of the three numbers 6*k + 1, 12*k + 1, 18*k + 1 are prime.at n=2A242980
• Carmichael numbers n such that n-1 is not a practical number.at n=3A265827
• Carmichael numbers m such that A309132(m) < m.at n=11A309268
• a(n) is the numerator of the squared circumradius of a cyclic quadrilateral with sides n, n+1, n+2, n+3.at n=14A351696
• a(n) = (6*n + 1)*(12*n + 1)*(18*n + 1).at n=15A382809