20338

Appears in sequences

• Least k such that the first k terms of the Kolakoski sequence (A000002) contain n more 2's than 1's.at n=11A025503
• Numbers n such that 141*2^n-1 is prime.at n=22A050596
• Position of first appearance of each integer in A088568 (number of 1's minus number of 2's in first n terms of A000002).at n=23A288605
• a(n) = index where A088568 (or equally A294448) first reaches or exceeds n in magnitude.at n=11A294449
• Numbers n such that there are precisely 2 groups of order n and 3 of order n + 1.at n=19A296025
• a(n) = n^5/5 + n^3/3 + 7*n/15.at n=10A385894