80190

Appears in sequences

• Numbers k such that 3*2^k + 1 is prime.at n=33A002253
• a(n) = 4n^3 + 2n^2.at n=26A089207
• Numbers n divisible by exactly three nontrivial permutations (rearrangements) of the digits of n.at n=11A090058
• Area of the Pythagorean triangle a = u^2 - v^2 (cf. A096382) when u=3, v=4,4,5,...at n=26A096383
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, -1), (-1, 0, 1), (0, 1, -1), (1, 0, 0)}.at n=12A148140
• The number of binary pattern classes in the (2,n)-rectangular grid with 8 '1's and (2n-8) '0's: two patterns are in same class if one of them can be obtained by a reflection or 180-degree rotation of the other.at n=11A228583
• Numbers k such that 3*2^k + 1 is a prime factor of a generalized Fermat number 3^(2^m) + 1 for some m.at n=25A268657
• Numbers k such that 3*2^k + 1 is a prime factor of a generalized Fermat number 11^(2^m) + 1 for some m.at n=10A282944
• Pentagonal pyramidal numbers divisible by 3.at n=36A299412
• Numbers k such that (k*2^d + 1)*(d*2^k + 1) is semiprime for some divisor d of k.at n=21A382887