291721

Properties

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 98.at n=3A031686
• Numbers k such that 1/(1/phi(k) + 1/phi(k+1) + 1/phi(k+2) + 1/phi(k+3)) is an integer.at n=24A073544
• Smallest prime p that is a palindrome in n different bases < p.at n=15A087911
• Primes of the form n^2 + (n+1)^3.at n=15A155933
• Primes of the form ((p+1)/2)^3 + ((p-1)/2)^2 where p is prime.at n=12A163428
• Primes p such that (p+1)/2, (p+2)/3 and (p+3)/4 are also primes.at n=11A163573
• The first number that is (at least) n-fold intrinsically 3-palindromic (represented in base ten).at n=12A171702
• The first number that is (at least) n-fold intrinsically 3-palindromic (represented in base ten).at n=13A171702
• a(n) is the smallest integer with at least n palindromic representations of length >= 3 in bases b >= 2.at n=12A275220
• a(n) is the smallest integer with at least n palindromic representations of length >= 3 in bases b >= 2.at n=13A275220
• The maximum number of coins that can be processed in n weighings where all coins are real except for one LHR-coin.at n=14A279682
• Numbers k such that (13*10^k - 43)/3 is prime.at n=29A290962
• Number of nX6 0..1 arrays with every element equal to 0, 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=6A300496
• Number of nX7 0..1 arrays with every element equal to 0, 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=5A300497
• Numbers k such that 1/(1/phi(k) + 1/phi(k+1) + 1/phi(k+2) + 1/phi(k+3) + 1/phi(k+4)) is an integer.at n=5A341745
• Prime numbersat n=25365