63321

Appears in sequences

• Numbers k such that 1 + 2^k + 4^k + 6^k is prime.at n=5A081510
• Consider the least number n such that n divided by pi(n) rounded is greater than any previous n; a(n) is the denominator of n/pi(n).at n=11A107614
• p-INVERT of the odd positive integers, where p(S) = 1 - S - 7 S^2.at n=6A292490
• a(n) = Sum_{k=0..n} A271703(k + n, n), row sums of A355005.at n=4A355004