28663

Properties

Appears in sequences

• Primes that remain prime through 3 iterations of function f(x) = 8x + 5.at n=24A023293
• a(n) is the first prime p from A031924 such that A052180(primepi(p)) = prime(n).at n=26A052229
• Numbers p such that p = (prime(n)+ prime(n+3))/2 is prime for prime indices n=2, 3, 5...at n=27A098039
• a(1) = 3, a(n + 1) = 1 + a(n) + least odd prime factor of a(n).at n=33A144751
• Number of nontrivial compositions of differential operations and directional derivative of the n-th order on the space R^10.at n=22A187179
• Primes of the form 7n^3-9.at n=3A200954
• Primes of the form 7n^2 - 9.at n=14A201854
• Engel expansion of cos(1)/(1+cos(1)).at n=7A222482
• Number of compositions of n into distinct parts with exactly two descents.at n=26A241721
• Largest prime all of whose substrings in its base n representation are primes.at n=17A245277
• Primes for which the sum of all preceding odd-indexed prime gaps is exactly one greater than the sum of all preceding even-indexed prime gaps.at n=23A282178
• Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 670", based on the 5-celled von Neumann neighborhood.at n=14A283607
• The sum of the first n terms of the sequence is the concatenation of the first n bits of the sequence read as binary, with a(1) = 1.at n=15A308092
• Union of 2, A282178, and A330339.at n=32A330554
• a(1) = 3; a(2) = 5; a(n+1) = a(n) + b(n), where b(n) = max {a(n-1)+-1, a(n-2)+-1, a(n-3)+-1, ..., a(1)+-1} such that a(n) + b(n) is a prime.at n=32A352952
• Prime numbersat n=3123