21169

Properties

Appears in sequences

• A variant of the cuban primes: primes p = (x^3 - y^3)/(x - y) where x = y + 2.at n=16A002648
• a(n) = Sum_{i=0..n} Sum_{j=0..i} T(i,j), T given by A026519.at n=11A026533
• Numbers whose square is palindromic in base 12.at n=26A029737
• Primes that are palindromic in base 12.at n=26A029979
• Denominators of continued fraction convergents to sqrt(37).at n=4A041061
• Denominators of continued fraction convergents to sqrt(148).at n=4A041271
• Denominators of continued fraction convergents to sqrt(333).at n=4A041629
• Denominators of continued fraction convergents to sqrt(429).at n=9A041817
• Denominators of continued fraction convergents to sqrt(592).at n=4A042135
• Denominators of continued fraction convergents to sqrt(925).at n=8A042789
• a(n) = n^4 + 3*n^2 + 1.at n=12A057721
• Primes p such that x^49 = 2 has no solution mod p, but x^7 = 2 has a solution mod p.at n=7A059667
• a(n) is the smallest k such that (k^3 + 1)/(n^3 + 1) is an integer > 1.at n=27A065964
• Primes of the form n^2*totient(n)+1 (or A053191(n) + 1).at n=14A076669
• Numbers generated by the Fibonacci polynomial x^4 + 3x^2 + 1.at n=11A085151
• Pell equation solutions (6*b(n))^2 - 37*a(n)^2 = -1 with b(n) = A097729(n), n >= 0.at n=2A097730
• a(n) = n^3 - n^2 + 1.at n=28A100104
• Primes p such that sigma(k) = phi(prime(k)-1), where p = prime(k).at n=16A107815
• Primes congruent to 2 mod 61.at n=39A142800
• Primes of the form Sum_{k=1..m} (m^k mod (m-k+1)).at n=40A156559