28085

Appears in sequences

• Nearest integer to 24*(2^n - 1)/n.at n=13A003138
• Integer part of 24(2^n-1)/n.at n=13A003176
• Strong pseudoprimes to base 32.at n=33A020258
• Numbers having four 6's in base 8.at n=29A043448
• Pentagonal numbers with prime indices.at n=32A116995
• Sum of the products of the first n prime pairs.at n=11A135232
• Third left hand column of triangle A163940.at n=20A163943
• a(n) = n-1 for n <= 4, otherwise if n is even then a(n) = a(n-5)+2^(n/2), and if n is odd then a(n) = a(n-1)+2^((n-3)/2).at n=28A200310
• Pentagonal numbers (A000326) which are also centered square numbers (A001844).at n=4A254711
• Number of aperiodic necklaces (Lyndon words) with k<=5 black beads and n-k white beads.at n=44A277629
• 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 726", based on the 5-celled von Neumann neighborhood.at n=14A283818
• a(n) = (A001359(n+1)^2 - 1)/24, where A001359 = lesser of twin primes; or: pentagonal numbers (A000326) whose indices are twin ranks (A002822).at n=30A308344
• a(n) is the smallest positive integer x such that sqrt(2) + sqrt(x) is closer to an integer than any other value already in the sequence.at n=17A309815
• Numbers k such that the equation x^2 - k*y^4 = -1 has a solution for which |y| > 2.at n=17A356488
• Centered square numbers which are sphenic numbers.at n=14A380882
• E.g.f. A(x) satisfies A(x) = 1/( 1 - x * A(x)^2 * cos(x * A(x)^2) ).at n=5A381479
• Pentagonal numbers which are products of three distinct primes.at n=30A381650
• Consecutive states of the linear congruential pseudo-random number generator for the Texas Instruments TI99 when started at 1.at n=28A384221