21865

Appears in sequences

• a(n) = A000081(n+1) - 2*A000081(n).at n=10A074797
• Minimal peaks in digital expansions of Pi: positions of peaks equal to 1.at n=21A105275
• a(n) = prime(1^3) + prime(2^3) + prime(3^3) + ... + prime(n^3).at n=9A109789
• a(n) = 841*n - 1.at n=25A158402
• a(n) = 26*n^2 - 1.at n=28A158551
• Starts of runs of 4 consecutive integers that are greedy Jacobsthal-Niven numbers (A364379).at n=14A364382