72900

Appears in sequences

• a(n) = floor(n/5)*floor((n+1)/5)*floor((n+2)/5)*floor((n+3)/5)*floor((n+4)/5).at n=47A008382
• Specific heat coefficients for square lattice spin 5/2 Ising model.at n=35A010114
• a(n) = (6*n)^2.at n=45A016910
• a(n) = (8*n+6)^2.at n=33A017138
• a(n) = (9*n)^2.at n=30A017162
• a(n) = (10*n)^2.at n=27A017270
• a(n) = (11*n + 6)^2.at n=24A017462
• a(n) = (12*n + 6)^2.at n=22A017594
• Numbers of form 3^i*10^j, with i, j >= 0.at n=32A025616
• Numbers of form 9^i*10^j, with i, j >= 0.at n=17A025635
• Smallest nontrivial extension of n^2 which is a square.at n=26A030686
• Smallest nontrivial extension of n-th cube which is a square.at n=8A030693
• Squares with initial digit '7'.at n=13A045791
• Squares resulting from procedure described in A048391.at n=8A048392
• Sigma(n) / d(n) is a perfect square associated with A049226.at n=26A049227
• Numbers m such that A062401(m) = phi(sigma(m)) is increasing to a record value, i.e., A062401(m) represents a new peak, so that A062401(m) > A062401(k) for all k < m.at n=35A065391
• Numbers n such that the square root of n is an integer and a multiple of the sum of the digits of n.at n=28A067521
• Numbers k such that phi(k)^2+sigma(k)^2 is prime.at n=34A068367
• Squares k^2 such that A068864(k) = k^2.at n=23A068867
• Numbers k such that the numerator of Sum_{d|k} 1/d > 3*k.at n=9A069096