41847

Appears in sequences

• The array in A059219 read by antidiagonals in 'up' direction.at n=53A059220
• The array in A059219 read by antidiagonals in the direction in which it was constructed.at n=53A059235
• Non-palindromic numbers n such that phi(n) = phi(reversal(n)).at n=25A097647
• G.f.: 1/G(0) where G(k) = 1 + (-q)^(k+1) / (1 - (-q)^(k+1)/G(k+1) ).at n=62A227310
• Number of Dyck paths of semilength n having exactly 3 (possibly overlapping) occurrences of the consecutive steps UDUUUDDDUD (with U=(1,1), D=(1,-1)).at n=7A243873
• Numbers k such that A353802(k) / sigma(sigma(k)) is an integer > 1, where A353802(n) = Product_{p^e||n} sigma(sigma(p^e)).at n=28A353807