23723

Appears in sequences

• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 44.at n=6A031722
• Position where n (presumably) appears the last time in A107261, or 0 if n keeps appearing.at n=20A107262
• Number of walks within N^2 (the first quadrant of Z^2) starting and ending at (0,0) and consisting of n steps taken from {(-1, -1), (-1, 0), (-1, 1), (0, 1), (1, -1)}.at n=13A151337
• a(n) = 49*n^2 + 7.at n=21A158481
• G.f. satisfies: A(x) = exp( Sum_{n>=1} sigma(n)*A(x^n)*x^n/n ).at n=11A179467
• a(n) = 4^n + 6*2^n + 3^(n+1) + 10.at n=7A254363
• Third partial sums of seventh powers (A001015).at n=3A254641
• a(1) = 1; a(n+1) = Sum_{d|n} sigma(n/d)*a(d), where sigma = sum of divisors (A000203).at n=36A307817