24001

Properties

Appears in sequences

• Crystal ball sequence for A_4 lattice.at n=9A008384
• Numbers k such that the continued fraction for sqrt(k) has period 71.at n=20A020410
• Primes with 14 as smallest positive primitive root.at n=17A061327
• Primes p such that the greatest prime divisor of p-1 is 5.at n=43A061599
• a(n) is the largest prime factor of 2^n + 3^n.at n=29A094474
• a(n) = 1 + (the n-th term in sequence A_n, ignoring the offset), or a(n) = -1 if A_n has fewer than n terms.at n=19A102288
• a(n) = 1 + A_n(n), or a(n) = -1 if sequence A_n is not defined up to index n.at n=19A107357
• Lesser prime in pair prime(k) +/- k for some k.at n=35A107636
• Primes of the form 2^a * 3^b * 5^c + 1 for positive a, b, c.at n=34A114991
• Primes p for which the period length of 1/p is a perfect power, A001597.at n=39A128948
• Primes of the form 1000*k + 1.at n=8A156655
• a(n) = 60*n^2 + 1.at n=20A158673
• Primes dividing repunits R(10^n) for some n.at n=28A178070
• Prime numbers of the form n*b^n + 1, where b, n >= 2.at n=25A178541
• Primes of the form 250n + 1.at n=27A179231
• Half the number of (n+1) X 3 binary arrays with no 2 X 2 subblock having exactly 2 ones.at n=7A183775
• Half the number of (n+1) X 8 binary arrays with no 2 X 2 subblock having exactly 2 ones.at n=2A183780
• T(n,k) = half the number of (n+1) X (k+1) binary arrays with no 2 X 2 subblock having exactly 2 ones.at n=34A183782
• T(n,k) = half the number of (n+1) X (k+1) binary arrays with no 2 X 2 subblock having exactly 2 ones.at n=29A183782
• Least prime such that whenever 2*a(n) = p+q with p and q prime, one has p,q > prime(n).at n=35A185446