18257

Properties

Appears in sequences

• Primes that remain prime through 4 iterations of function f(x) = 4x + 9.at n=7A023312
• Primes that remain prime through 5 iterations of function f(x) = 4x + 9.at n=0A023340
• Super-4 Numbers (4 * n^4 contains substring '4444' in its decimal expansion).at n=13A032744
• Least prime in A031930 (lesser of 12-twins) whose distance to the next 12-twin is 2*n.at n=10A052355
• Number of trees with n nodes and 12 leaves.at n=6A055299
• Primes p whose period of reciprocal equals (p-1)/7.at n=16A056212
• a(n) = 2^n mod Fibonacci(n).at n=24A057862
• Primes p such that x^48 = 2 has no solution mod p, but x^24 = 2 has a solution mod p.at n=26A059669
• Antidiagonal sums of table A083362.at n=32A083364
• Integer part of square root of the reciprocal of a number multiplied by 10 to the power of the integer part of the square root of the number.at n=29A089245
• Primes p of the form 2*prime(k) + 3 such that 2*prime(k+1) + 3 is the next prime after p.at n=36A089528
• Numbers whose square starts with 4 identical digits.at n=17A132391
• Primes congruent to 26 mod 59.at n=32A142753
• Primes congruent to 18 mod 61.at n=36A142816
• a(n)=Mod(2^Fibonacci(n),Fibonacci(n)).at n=24A171244
• a(n) is the sum of the smallest parts of all partitions of n that do not contain 1 as a part.at n=40A182708
• Primes of the form k^2 - prime(k).at n=16A188831
• Primes of the form 3n^2 + 5.at n=21A201478
• Records in A096335 (values).at n=31A221181
• Number of (n+1) X 4 0..1 matrices with each 2 X 2 permanent equal.at n=3A224740