20666

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has period 59.at n=30A020398
• Numbers k such that 79*2^k+1 is prime.at n=9A032389
• Number of planar n X n X n binary triangular grids with no more than 2 ones in any 4 X 4 X 4 subtriangle.at n=7A153527
• Numbers n such that 10^n - 99 is prime.at n=15A178439
• Convolution of Fibonacci numbers (A000045) and partition numbers (A000041).at n=18A275388
• Number of set partitions of [n] such that all absolute differences between least elements of consecutive blocks are <= five.at n=9A287255
• Numbers n such that there are precisely 2 groups of order n and 3 of order n + 1.at n=20A296025
• Number of integer partitions of n with non-biquanimous multiplicities.at n=39A371840