31237

Properties

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 11.at n=36A031599
• Partial sums of A000285.at n=18A053311
• Numbers k such that 6^k - 5^k is prime.at n=10A062572
• Iterate function described in A084317 if started at initial value n until reaching a fixed point.at n=61A084318
• a(n) is the least positive integer such that the integer part of the arithmetic-geometric mean of a(n) and 1 is equal to Fibonacci(n).at n=18A090854
• A symmetrical triangle T(n, m) = 2*Eulerian(n+1, m) -1, read by rows.at n=31A176200
• A symmetrical triangle T(n, m) = 2*Eulerian(n+1, m) -1, read by rows.at n=32A176200
• Primes whose binary and ternary representations are also prime when read in decimal.at n=33A236537
• Limiting value of the iterated process of factoring n and concatenating prime powers (in decimal) in the order of increasing primes.at n=61A239448
• Number of (6+1) X (n+1) 0..1 arrays with every 2 X 2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically.at n=11A258559
• Primes p such that 2*p + 1 is abundant.at n=34A267476
• Prime numbersat n=3366