45149

Appears in sequences

• Number of positive integers <= 2^n of form 5 x^2 + 7 y^2.at n=19A054177
• a(1)=1, a(n) is the smallest integer > a(n-1) such that the sum of elements of the simple continued fraction for S(n)=1/a(1)+1/a(2)+...+1/a(n) equals n*(n+1)/2 the n-th triangular number.at n=35A071184
• a(2) = 0, and otherwise a(n) is the least multiple of prime(n+1) whose decimal representation ends with that of prime(n).at n=34A333577