70227

Appears in sequences

• Numbers n such that n | 11^n + 10^n + 9^n + 8^n + 7^n + 6^n.at n=39A057258
• a(0) = 3, a(1) = 8, a(n+2) = 4*a(n+1) - a(n) - 2.at n=8A102206
• Numbers k such that 7*10^k + 8*R_k - 5 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=12A103066
• Numbers that factorize into a prime number of factors all raised to different prime exponents and no number appears both as an exponent and as a prime factor.at n=21A114131
• a(n) = ((sqrt(3)+1)^n+(sqrt(3)-1)^n)^2/2^(n+1).at n=9A121401
• Consider all consecutive integer Pythagorean septuples (X, X+1, X+2, X+3, Z-2, Z-1, Z) ordered by increasing Z; sequence gives Z values.at n=4A157089
• Product of the 5th power of a prime and different distinct prime of the 2nd power (p^5*q^2).at n=21A179646
• Numbers of the form 20*k+7 which are three times a square.at n=30A192328
• Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any horizontal, vertical or antidiagonal neighbor, and containing the value n(n+1)/2-2.at n=26A211924
• a(n) = 4*n^3 - 3*n + 1.at n=26A280089
• Number of chordless cycles in the complete tripartite graph K_{n,n,n}.at n=17A297662
• Numbers > 1 that are not a prime power and whose prime indices and exponents are all themselves prime numbers.at n=33A352518