23753

Properties

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has period 91.at n=16A020430
• Primes with at least one of each prime digit.at n=12A108419
• Primes with prime number of only prime digits (i.e., 2, 3, 5, 7).at n=30A124888
• Primes p of Erdos-Selfridge class 4+ with largest prime factor of p+1 not of class 3+.at n=19A129472
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, 0, 0), (0, -1, 1), (0, 1, 1), (1, 1, -1)}.at n=9A148895
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 1, -1), (0, 0, -1), (0, 0, 1), (1, 0, 0)}.at n=9A149910
• Primes with a prime number of digits and using all of the prime digits 2, 3, 5, 7 at least once and no other digits.at n=4A153770
• Primes of the form 2n^2-9.at n=33A155702
• a(n) = index of second occurrence of A161926(n) in A114381.at n=11A161927
• Primes of the form 3n^2 - 10.at n=14A201782
• Number of n X n 0..6 symmetric arrays with every row summing to 3*n.at n=3A213798
• T(n,k)=Number of n X n 0..k symmetric arrays with every row summing to floor(n*k/2).at n=39A213800
• Number of 4X4 0..n symmetric arrays with all rows summing to 2*n.at n=5A213802
• Greatest of 4 consecutive primes with consecutive gaps 2, 4, 6.at n=27A290706
• Prime time primes (of the form HMMSS with primes H < 24 and MM, SS < 60) such that the corresponding number of seconds after midnight is also prime.at n=29A295000
• Primes p such that (p+nextprime(p))/6 is prime and 6*p is the sum of two consecutive primes.at n=25A339775
• Primes whose digits are prime in both base 9 and base 10.at n=11A368805
• Prime numbersat n=2642