42643

Properties

Appears in sequences

• Largest prime factor of 2*n^3 - 2*n + 9.at n=39A127990
• Sequence is obtained from Catalan numbers (A000108) by taking the factorial of each digit and adding them up.at n=29A165163
• Noncomposite numbers in the southwestern ray of the Ulam spiral as oriented on the March 1964 cover of Scientific American.at n=26A168026
• Primes of the form n^2 + n + 1, where n is semiprime.at n=18A193144
• Number of ordered triples (w,x,y) with all terms in {1,...,n} and w^2+x^2+y^2>=2n.at n=35A211645
• Primes that are reached by an ever increasing aliquot sequence.at n=23A234842
• Let p = n-th prime == 7 mod 8; a(n) = sum of quadratic residues mod p that are > p/2.at n=24A282040
• Numbers n such that for every k = 1, 2, ..., A305706(n)-1, it is possible to insert plus signs into the decimal representation of n^k to make sum equal n.at n=46A305707
• Brazilian primes that are also the greater of a pair of twin primes.at n=28A306889
• Primes that are palindromic in factorial base.at n=30A333421
• Prime numbersat n=4457