19861

Properties

Appears in sequences

• Strobogrammatic primes.at n=6A007597
• Powers of fourth root of 14 rounded up.at n=15A018086
• Strobogrammatic primes: the same upside down (calculator-style numerals).at n=14A018847
• Numbers k such that the continued fraction for sqrt(k) has period 97.at n=9A020436
• Primes p such that the sum of the digits of p is not prime, but the sum of the cubes of the digits of p is prime.at n=35A091365
• Strobogrammatic non-palindromic primes.at n=2A133207
• Prime numbers p such that p +- ((p-1)/5) are primes.at n=17A137714
• Primes congruent to 36 mod 61.at n=36A142834
• Primes with a prime number of partitions into prime parts.at n=26A146949
• Largest primes of 'a' consecutive primes whose sum is a prime in A152471.at n=39A152472
• Primes p such that p^3-p^2-1 and p^3-p^2+1 are prime.at n=30A160858
• Number of (w,x,y) with all terms in {0,...,n} and 2*w >= |x+y-z|.at n=30A213397
• Primes of the form 2*n^2 + 54*n + 25.at n=8A217497
• Non-palindromic balanced primes in base 2.at n=38A256081
• Strobogrammatic nonpalindromic numbers.at n=27A287092
• Least prime p such that p minus the multiplication of its digits is the n-th prime before p.at n=44A321570
• Terms k of A112998 such that k+2 is nonsquarefree.at n=18A328160
• Number of maximal irredundant sets in the n-triangular honeycomb obtuse knight graph.at n=6A347997
• Irregular table read by rows: T(n,k) is the number of k-gons, k>=2, among all distinct circles that can be constructed from an n x n square grid of points using only a compass.at n=18A359935
• a(n) = (2*n-1)!! * Sum_{k=0..n} k/(2*k-1)!!.at n=6A368792