27961

Properties

Appears in sequences

• Number of n-node rooted trees of height 8.at n=15A000429
• Irregular table read by rows: row n lists prime factors of 10^n + 1, with multiplicity.at n=23A001271
• Largest prime factor of the "repunit" number 11...1 (cf. A002275).at n=18A003020
• Largest prime factor of 10^n + 1.at n=10A003021
• Largest prime factor of 10^n - 1.at n=19A005422
• a(n) = largest prime factor of n^n + 1.at n=9A007571
• Divisors of 10^10 + 1.at n=3A027900
• Triangle of prime numbers in which n-th row lists all primes p such that 1/p has decimal period n, n >= 1.at n=31A046107
• Greatest prime number p(n) with decimal fraction period of length n.at n=19A061075
• a(1) = 1, a(n) = largest prime divisor of A057137(n).at n=18A073844
• a(1) = 1, a(n) = largest prime divisor of A057137(n).at n=19A073844
• a(1) = 1; for n > 1, a(n) = largest prime divisor of A062273(n).at n=19A077576
• Prime mean of 8 horizontal, vertical and main diagonal sums associated with primes in A094454.at n=29A094455
• Primes of the form k^3 + (k+1)^2.at n=14A100662
• a(n) = n^3 + (n+1)^2.at n=30A100705
• Number of n X n binary arrays with all ones connected only in a 01000-11111-01000 pattern in any orientation.at n=8A147019
• Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 01000-11111-01000 pattern in any orientation.at n=19A147021
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, 1, 1), (1, 0, 1), (1, 1, 0), (1, 1, 1)}.at n=7A151219
• Primes of the form (p-1)^3/8 + (p+1)^2/4 where p is prime.at n=8A163424
• Primes p such that 2*p^3-+15 are also prime.at n=37A174364