22515

Appears in sequences

• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 20.at n=14A031698
• a(n) = concatenation of n^2 and n.at n=14A055436
• a(n) = 100*n^2 + n.at n=14A055438
• Odd n such that 2*phi(n) < n, but there does not exist an even k < n with phi(k) = phi(n).at n=4A118700
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 1), (0, 1, 1), (1, -1, -1), (1, 1, -1)}.at n=9A148872
• a(n) = 225*n^2 + 15.at n=10A158557
• Numbers whose sum of triangular divisors is also a divisor and greater than 1.at n=29A209311
• Numbers k such that k divides the number of overpartitions of k (A015128).at n=24A299961
• Let b(1) = 3 and let b(n+1) be the least prime expressible as k*(b(n)-1)*b(n)-1; this sequence gives the values of k in order.at n=18A306601
• Odd numbers n for which A318879(n) is not zero and A318879(n) divides A318878(n); odd numbers such that A326140(n) = A318879(n).at n=3A326141