51092

Appears in sequences

• Numbers n such that phi(n) = 2*phi(n-2).at n=26A258454
• a(n) = 54*n^2 - 26*n + 4 (n>=1).at n=30A304381
• Number of regions in a "cross" of width 3 and height n (see Comments for definition).at n=21A331455
• Numbers that are the sum of seven fourth powers in ten or more ways.at n=11A345576
• Numbers that are the sum of seven fourth powers in exactly ten ways.at n=7A345832