22381

Properties

Appears in sequences

• Numbers having four 5's in base 8.at n=8A043444
• a(1) = 2; a(n)= smallest prime of the form k*a(n-1) + 1 where k itself is a multiple of n.at n=4A085873
• Smallest prime P such that P# - Mersenne-prime(n) is prime.at n=23A098566
• Numbers k such that 2^k modulo Fibonacci(k) is prime, i.e., A057862(k) is prime.at n=21A128161
• Primes p such that 42*p-1, 42*p+1 and 48*p-1, 48*p+1 are twin primes.at n=8A138697
• Smaller of two consecutive prime numbers such that p0+p1=average of twin prime pairs and p0*p1+7=average of twin prime pairs.at n=5A153374
• a(n) = 62*n^2 - 1.at n=18A158680
• Numbers k such that Sum_{i=1..k} i^6 divides Product_{i=1..k} i^6.at n=19A166606
• Numbers k with maximal exponent in prime factorization equal to 1, such that k+1 has maximal exponent 2, k+2 has maximal exponent 3, and k+3 has maximal exponent 4.at n=4A176913
• Number of distinct values of the sum of 2 products of three 0..n integers.at n=24A225259
• Triangle read by rows: T(n,m) (n >= 1, 1 <= m <= n) = number of set partitions of [n], avoiding 123454, with m blocks.at n=61A250119
• Prime numbersat n=2505