27197

Properties

Appears in sequences

• Convolution of composite numbers and odd numbers.at n=35A023650
• Numbers k such that 10^k + 4*R_k + 5 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=19A102935
• K-bit primes p such that p-2^i and p+2^i are composite for 0<=i<=K-1.at n=17A153352
• Numbers with d digits (d>0) which have at least 2d distinct primes as substrings.at n=31A168167
• Primes with nine embedded primes.at n=13A179917
• Primes P(k) such that (2^k-P(k))*2^k-1 is prime.at n=28A181291
• Primes of the form k^2 + prime(k).at n=24A184935
• Odd numbers m that are neither of the form p + 2^k nor of the form p - 2^k with 2^k < m, k >= 1, and p prime.at n=36A255967
• Primes p such that 2*prime(p) + 1 = prime(q) for some prime q.at n=28A261361
• Starting with 1,2,3,4,5,6: a(n) is the next smallest number greater than a(n-1) such that a[i] + a[j] + a[k] != a[x] + a[y] + a[z] for 1 <= i,j,k,x,y,z <= n all distinct.at n=29A317778
• Prime numbersat n=2979