101250

Appears in sequences

• Theta series of A*_24 lattice.at n=48A023936
• If there were a unimodular 25-dimensional lattice with minimal norm 3, it would have this as its theta series. Unfortunately, no such lattice exists.at n=4A027824
• Triangle whose (i,j)-th entry is binomial(i,j)*5^(i-j)*9^j.at n=17A038251
• Triangle whose (i,j)-th entry is binomial(i,j)*9^(i-j)*5^j.at n=18A038295
• Mean integral divisors associated with A048751.at n=10A048752
• For n>3: a(n) is a multiple of three distinct earlier terms.at n=25A060301
• Numbers k such that sigma(k) + tau(k) is a prime.at n=8A064205
• Babylonian reciprocals - factors needed to turn an ugly number into a power of sixty.at n=37A094086
• Even refactorable numbers k such that the number r of odd divisors and the number s of even divisors are both odd divisors of k and k is the first number for which the triple (r,s,t) occurs, where t is the number of divisors of k.at n=11A120358
• Even refactorable numbers k such that the number r of odd divisors of k and the number s of even divisors of k are both odd divisors of k.at n=32A120361
• Total number of line segments between points visible to each other in a square n X n lattice.at n=23A141255
• Totally multiplicative sequence with a(p) = 5*(p+1) for prime p.at n=39A166645
• Numbers with 50 divisors.at n=22A175756
• Numbers with prime factorization pq^4r^4.at n=21A190012
• a(n) = n^4*(n+1)^4/8.at n=4A202107
• Numbers m such that phi(m) is a power of the product of the distinct prime factors of m.at n=26A211413
• Smallest integer m > n such that both n*m and (n+1)*(m+1) are squares.at n=18A212651
• Number of (w,x,y,z) with all terms in {1,...,n} and |w-x| >= w + |y-z|.at n=30A212714
• Number of (w,x,y,z) with all terms in {0,...,n} and max{w,x,y,z}<2*min{w,x,y,z}.at n=30A212740
• Number of (w,x,y,z) with all terms in {0,...,n} and max{w,x,y,z}<=2*min{w,x,y,z}.at n=29A212742