72240

Appears in sequences

• n times the n-th n-gonal number.at n=20A117665
• a(n) = 24*p(n) = 24*A000041(n).at n=27A183008
• A Galton triangle: T(n,k) = 2*k*T(n-1,k) + (2*k-1)*T(n-1,k-1).at n=23A187075
• Numbers with prime factorization p*q*r*s*t^4 (where p, q, r, s, t are distinct primes).at n=20A190110
• Triangle T(n,k), 0<=k<=n, given by (0,2,0,4,0,6,0,8,0,10,0,...) DELTA (1, 2, 3, 4, 5, 6, 7, 8, 9,...) where DELTA is the operator defined in A084938.at n=31A211402
• Expansion of e.g.f. 1/(1 - Sum_{p prime} x^p / (p-1)!).at n=8A353165
• The smallest number k which, when written in base n, has a factorization k = f_1*f_2*...*f_r where f_i >= 1 and the digits of {k, f_1, f_2, ..., f_r} together contain the digits 0,1,...,(n-1) exactly once. Set a(n) = -1 if no such k exists.at n=10A372294