74665

Appears in sequences

• Strong pseudoprimes to base 2.at n=11A001262
• Composite numbers k such that k == +-1 (mod 8) and 2^((k-1)/2) == 1 (mod k).at n=26A006971
• Strong pseudoprimes to base 4.at n=25A020230
• Strong pseudoprimes to base 8.at n=34A020234
• Strong pseudoprimes to base 17.at n=27A020243
• Strong pseudoprimes to base 68.at n=38A020294
• Expansion of 1/((1-5x)(1-7x)(1-12x)).at n=4A020341
• Euler-Jacobi pseudoprimes: 2^((n-1)/2) == (2 / n) mod n, where (2 / n) is a Jacobi symbol.at n=29A047713
• Sarrus numbers n (A001567) which satisfy mu(n) = -1 and which are not Super-Poulet numbers (A050217).at n=28A074380
• Sarrus numbers with more than 2 distinct prime factors.at n=37A080747
• For p = prime(n), a(n) is the smallest base-2 pseudoprime N (that is, 2^(N-1) = 1 mod N) such that p divides N.at n=31A085999
• Numbers n such that n-1, n and n+1 can be expressed as a sum of 2 squares in at least 2 ways.at n=11A091459
• Strong pseudoprimes (base-2) equal to product of 3 primes not necessarily distinct.at n=3A112450
• Fermat pseudoprimes to base 2 of the form (6*k - 1)*((6*k - 2)*n + 1), where k and n are positive integers.at n=35A210993
• Poulet numbers (2-pseudoprimes) of the form 144*n^2 + 222*n + 85.at n=8A214017
• Fermat pseudoprimes to base 2 of the form m*n^2 + (11*m - 23)*n + 19*m - 49, where m, n >= 0.at n=28A215326
• Fermat pseudoprimes to base 2 with three prime factors.at n=28A215672
• Fermat pseudoprimes to base 2 divisible by 5.at n=14A216023
• Fermat pseudoprimes to base 2 which are congruent to 1 (mod 8).at n=34A218483
• Fermat pseudoprimes that are not Carmichael numbers and have only composite XOR couples as defined in A182108.at n=3A252944