48819

Appears in sequences

• Numbers k such that 19*2^k - 1 is prime.at n=24A001775
• Start with n, apply k->2k+1 until reach new record prime; sequence gives number of steps needed.at n=18A051918
• Semiprimes q such that q^2-4 and q^2+4 are also semiprimes.at n=32A173084
• Numbers k such that P = 2^k - 1 - Sum_{primes p<k} 2^(p-1) is prime.at n=28A215891
• Number of partitions of n with the property that if two summands have the same parity, then their frequencies have the same parity.at n=50A240949
• Composites whose prime factorization in base 8 is an anagram of the number in base 8.at n=22A260052
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 557", based on the 5-celled von Neumann neighborhood.at n=35A272926
• Magic numbers of anti-Mackay icosahedra.at n=22A277131