25309

Properties

Appears in sequences

• Value of D for incrementally largest values of minimal x satisfying Pell equation x^2-Dy^2=1.at n=40A033316
• Primes of the form 666*n + 1.at n=13A037029
• Primes whose 10's complement is a triangular number.at n=18A082992
• Difference between A007678(2n)/(2n) and (n-1)^2.at n=44A085611
• Last term of prime quadruples.at n=21A090258
• Least solution to the Pellian equation x^2 - k*y^2 = 1 (A002349) such that 2^2^n < y <= 2^2^(n+1).at n=11A099194
• Let p = prime(sigma(n)) and q = prime(phi(n)), then p is in the sequence if p-q = 6.at n=31A103176
• List of primitive prime divisors of the numbers 4^n-3^n (A005061) in their order of occurrence.at n=24A129737
• a(n) = 1 + n*(n+1)*(n-1)/2.at n=37A158842
• Least prime p = 1 (mod n) which divides Fibonacci((p-1)/n).at n=35A168171
• Primes of the form 2*n^2+6*n+1.at n=18A176549
• Least prime p such that the continued fraction expansion of its square root contains the first n natural numbers, but does not contain n+1.at n=16A185808
• a(n) = A188526(n)/7.at n=4A188527
• Centered 36-gonal numbers.at n=37A195316
• Primes remaining primes under map 3<=>5 (interchange of decimal digits 3 and 5).at n=38A198047
• Number of 2 X 2 matrices having all terms in {-n,...,0,...,n} and 0 <= determinant <= n.at n=11A211146
• Smallest prime q such that 2n+1 = p^3 - 2q for some odd prime p, or 0 if no such prime exists.at n=16A224730
• Primes p such that p-2 and q are primes, where q is concatenation of binary representations of p and p-2: q = p * 2^L + p-2, where L is the length of binary representation of p-2: L=A070939(p-2).at n=35A232237
• Expansion of psi(x^3)^3 / (psi(x)^2 * psi(x^2)) in powers of x where psi() is a Ramanujan theta function.at n=46A262157
• Primes p such that A001175(p) = (p-1)/9.at n=14A308794