47378

Appears in sequences

• Convolution of A001950 with itself.at n=33A023667
• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 25.at n=10A031613
• a(0) = a(1) = 1. a(n) = a(n-1) + a(n - b(n)), where b(n) is largest prime dividing n.at n=43A137809
• Eigentriangle, row sums = A144251 shifted, right border = A144251.at n=44A144252