39331

Appears in sequences

• Strong pseudoprimes to base 7.at n=11A020233
• Strong pseudoprimes to base 49.at n=18A020275
• T(n,4), array T as in A054126.at n=8A054130
• Zsigmondy numbers for a = 7, b = 1: Zs(n, 7, 1) is the greatest divisor of 7^n - 1^n (A024075) that is relatively prime to 7^m - 1^m for all positive integers m < n.at n=8A064083
• Numerator of sigma_3(n)/sigma(n).at n=48A091259
• Numbers which are the sum of two positive cubes and divisible by 37.at n=41A102618
• Positive integers of the form (10*m^2+1)/11.at n=37A179338
• Numbers that are both a sum of two positive cubes and a difference of two consecutive cubes.at n=7A225909
• Semiprimes formed by inserting a semiprime between the semiprime's ordered factors.at n=12A227942
• Number of (n+1) X (1+1) 0..4 arrays with every 2 X 2 subblock having the absolute values of all six edge and diagonal differences no larger than 1.at n=4A234029
• Number of (n+1)X(5+1) 0..4 arrays with every 2X2 subblock having the absolute values of all six edge and diagonal differences no larger than 1.at n=0A234033
• T(n,k)=Number of (n+1)X(k+1) 0..4 arrays with every 2X2 subblock having the absolute values of all six edge and diagonal differences no larger than 1.at n=10A234036
• T(n,k)=Number of (n+1)X(k+1) 0..4 arrays with every 2X2 subblock having the absolute values of all six edge and diagonal differences no larger than 1.at n=14A234036
• Euler pseudoprimes to base 7: composite integers such that abs(7^((n - 1)/2)) == 1 mod n.at n=27A262054
• Sum of two (possibly negative) coprime cubes in at least 2 ways, but not the sum of 2 noncoprime cubes.at n=25A293648
• Numerator of sigma_3(n)/sigma_2(n).at n=48A298754
• Numbers k for which rank of the elliptic curve y^2 = x^3 - 432*k^2 is 4.at n=5A309964
• Left-truncatable happy numbers: every suffix is a happy number and no digits are zero.at n=26A383639