23039

Properties

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 78 ones.at n=36A031846
• Primes p such that there is no Carmichael number pqr, p<q<r q, r primes.at n=24A051663
• Smallest initial value k that reaches 1 in n steps when iterating the map m -> rad(m)-1, where rad(m) is the squarefree kernel of m (A007947).at n=22A075426
• Near twin primes of order 18: twin primes (p, p+2) such that p+18 and p+20 are primes.at n=33A079304
• Primes p such that 5 is the largest of all prime factors of the numbers between p and the next prime (cf. A052248).at n=17A080185
• Primes resulting from serial multiplication of even composites, minus 1.at n=3A093155
• A sequence of asymptotic density zeta(10) - 1, where zeta is the Riemann zeta function.at n=22A143036
• Primes of the form 10*k^2 - 1.at n=9A143828
• Primes p such that (p-n)/(n+1) and (n+1)*p+n are both prime, with n=127.at n=2A152388
• Primes p of the form A152539(n) + 1.at n=32A152540
• a(n) = 40*n^2 - 1.at n=23A158598
• Primes p dividing every A167859(m) from m=(p-1)/2 to m=(p-1).at n=30A167860
• Gullwing primes: primes in the gullwing sequence A187220.at n=36A187222
• Numbers m such that m, m-1, m-2 and m-3 are 1,2,3,4-almost primes respectively.at n=32A201220
• Number of 5-bead necklaces labeled with numbers -n..n not allowing reversal, with sum zero and avoiding the patterns z z+1 z+2 and z z-1 z-2.at n=9A209117
• The first member of a twin prime pair whose sum equals the sums of two consecutive smaller pairs of twin primes.at n=35A225943
• Primes of the form 45*2^n - 1.at n=7A230168
• Primes of the form 2*n^2+26*n+11.at n=30A243888
• Lesser of twin primes such that sum of twin prime pair is the sum of 2 nonzero squares.at n=43A270245
• Primes p such that there are exactly p solutions to y^2 + x*y + y == x^3 + x^2 - 10*x - 10 (mod p).at n=27A275777