50431

Appears in sequences

• Indices of primes at which the prime race 4k-1 vs. 4k+1 is tied.at n=22A038691
• a(n) = (72 - 258*n + 601*n^2 - 264*n^3 + 33*n^4)/4.at n=11A108642
• Numbers to which Mersenne primes 2^p-1 can be congruent mod k! (for k > 1).at n=14A145038
• a(n) = 30*n^2 + 1.at n=41A158558
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 203", based on the 5-celled von Neumann neighborhood.at n=42A270727
• Numbers n such that phi(n) is a Fibonacci number.at n=39A280592
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of e.g.f.: exp(Sum_{j>=1} sigma_k(j) * x^j).at n=34A294296
• E.g.f.: exp(Sum_{n>=1} sigma(n) * x^n).at n=6A294361
• Heinz numbers of integer partitions into relatively prime parts whose reciprocal sum is the reciprocal of an integer.at n=19A316901
• Heinz numbers of strict integer partitions with relatively prime parts in which no two parts are relatively prime.at n=4A318716
• Heinz numbers of integer partitions with no two distinct parts relatively prime, but with no divisor in common to all of the parts.at n=19A328679
• Heinz numbers of integer partitions with no two (not necessarily distinct) parts relatively prime, but with no divisor in common to all of the parts.at n=3A328868
• a(n) = n * Sum_{d|n} sigma(d)^3 / d.at n=21A344043