28201

Properties

Appears in sequences

• Smallest nontrivial extension of n-th palindrome which is a prime.at n=36A030675
• Numbers k such that 1000k+1, 1000k+3, 1000k+7, 1000k+9 are all primes.at n=13A064962
• Primes of the form floor((9/8)^k).at n=17A067910
• Smallest prime factor of n^n-(n-1)^(n-1).at n=11A068954
• Let f(n) = exp(Pi*sqrt(n)); sequence gives numbers n such that f(n) - floor(f(n)) < 1/10^3.at n=30A127028
• Let f(n) = exp(Pi*sqrt(n)); sequence gives numbers n such that f(n) - floor(f(n)) < 1/10^4.at n=6A127029
• a(n) = 1 + n*(n+1)*(n^2-n+12)/12.at n=24A136396
• Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, 0), (0, -1), (0, 1), (1, 0), (1, 1)}.at n=7A151319
• Primes of the form (p^2 - 1)/8 - p, where p is also a prime.at n=20A165567
• Primes of the form 8*k^2 + 6*k - 1 for positive k.at n=31A187677
• Expansion of 1/(-32*x^5 + 8*x^3 - 4*x^2 - x + 1).at n=13A205961
• Smallest prime factor of 3*(2n+1)^(2n+1) + 2.at n=37A216146
• Primes p such that 1000p+1, 1000p+3, 1000p+7 and 1000p+9 are prime.at n=3A242562
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 805", based on the 5-celled von Neumann neighborhood.at n=28A273604
• Primes p such that both 2p-1 and 2p^2-2p+1 are prime.at n=37A274609
• Centered 25-gonal primes.at n=10A276264
• Larger of super amicable pair m < n defined by sigma(sigma(m)) = sigma(sigma(n)) = m + n.at n=1A324256
• Primes in A114381.at n=41A345099
• a(n) = Sum_{k=0..floor((2*n+1)/5)} binomial(2*k+1,2*n-5*k+1).at n=24A392487
• Expansion of 1 / ((1-x)^5 - x^7).at n=15A392546