20285

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 25.at n=5A031613
• Denominators of continued fraction convergents to sqrt(482).at n=6A041921
• Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 11.at n=18A051976
• Pseudo-random numbers: gcc 2.6.3 version for 32-bit integers.at n=22A084276
• Expansion of chi(x) / phi(x^2) in powers of x where phi(), chi() are Ramanujan theta functions.at n=49A085261
• Number of permutations of length n which avoid the patterns 2314, 3241, 4132.at n=9A116796
• a(n) = Sum_{k=1..n} k*sigma(k).at n=32A143128
• a(n) = 46*n^2 - 1.at n=20A158634
• Number of partitions p of n such that (number of numbers of the form 3k+1 in p) is a part of p.at n=39A241547
• Number of (n+1) X (4+1) 0..1 arrays with every 2 X 2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically.at n=8A258550