24900

Appears in sequences

• a(n) = (n/2)*(n + 1)*(3*n + 11).at n=23A059997
• Expansion of q * (psi(q^3)^3 / psi(q)) / (phi(-q)^3 / phi(-q^3)) in powers of q where phi(), psi() are Ramanujan theta functions.at n=10A128638
• Numbers n that raised to the powers from 1 to k (with k>=1) are multiple of the sum of their digits (n raised to k+1 must not be a multiple). Case k=10.at n=33A135195
• Numbers k such that the average digit of k^2 is 1.at n=26A164771
• Numbers n with property that concatenation (2*n+1)//n of the decimals is a square.at n=8A176185
• Expansion of psi(x) * f(-x^18)^3 / (phi(-x^3) * f(-x^3)^3) in powers of x where phi(), psi(), f() are Ramanujan theta functions.at n=31A261992
• Exponential (2,3)-perfect numbers: numbers m such that esigma(esigma(m)) = 3m, where esigma(m) is the sum of exponential divisors of m (A051377).at n=23A328132