34133

Appears in sequences

• Deceptive nonprimes: composite numbers k that divide the repunit R_{k-1}.at n=35A000864
• Strong pseudoprimes to base 23.at n=19A020249
• Expansion of x*(x^3+2*x^2+3*x-1)/(x+1)^5.at n=22A119515
• 3-almost prime octagonal numbers.at n=24A129927
• Numbers n such that n!8 + 2 is prime.at n=54A204663
• Octagonal numbers with prime indices.at n=27A267144
• Smallest composite c where exactly n composites d with d < c exist such that c^(d-1) == 1 (mod d) and d^(c-1) == 1 (mod c).at n=24A270575
• Numbers n such that n^2048 + (n+1)^2048 is prime.at n=28A274235
• Terms of A324315 (squarefree integers m > 1 such that if prime p divides m, then the sum of the base p digits of m is at least p) that are also octagonal numbers (A000567) with index equal to their largest prime factor.at n=5A324320
• Products of three distinct strong primes.at n=36A363782
• Triangle read by rows: T(n,k) = arithmetic derivative of ((A002110(n) + A002110(k)) / A002110(k)), 1 <= k <= n.at n=31A370136
• Octagonal numbers that are the product of three distinct primes.at n=19A382231