64516

Appears in sequences

• a(n) = (7*n+2)^2.at n=36A017006
• a(n) = (8*n+6)^2.at n=31A017138
• a(n) = (9*n + 2)^2.at n=28A017186
• a(n) = (10*n + 4)^2.at n=25A017318
• a(n) = (11*n+1)^2.at n=23A017402
• a(n) = (12*n + 2)^2.at n=21A017546
• a(n) = Sum_{i=1..floor((n+1)/4)} a(2*i-1) * a(n-2*i+1), with a(1)=a(2)=1 and a(3)=4.at n=17A024727
• Squares with initial digit '6'.at n=18A045789
• a(n) and floor(a(n)/7) are both squares; i.e., squares which remain squares when written in base 7 and last digit is removed.at n=8A055859
• a(n) = 4*prime(n)^2.at n=30A069262
• Triangular numbers + 1 squared.at n=22A086601
• Smallest square k such that k-1 is a squarefree number with n prime divisors.at n=4A088027
• Perfect powers beginning and ending with the same digit.at n=32A128827
• a(n) = count of monomials, of degrees k=1 to n, in the Schur symmetric polynomials s(mu,k) summed over all partitions mu of n.at n=6A209672
• Number of (n+2) X (6+2) 0..1 arrays with no 3 x 3 subblock diagonal sum less than the antidiagonal sum or central row sum less than the central column sum.at n=10A258892
• Squares that become prime when their rightmost digit is removed.at n=20A265211
• a(n) = [x^n] Product_{k>=1} ((1 + x^k)/(1 + x^(n*k)))^n.at n=9A304626
• Number of compositions of n whose set of distinct parts is pairwise coprime, where a singleton is always considered coprime.at n=18A337664
• Perfect powers k such that A052409(k) is equal to A052409(A366275(k)).at n=13A366278
• Split A377091 into sublists consisting of runs of terms with the same sign. Sequence gives k's such that A377091(k) is the first term of those sublists whose terms (in absolute value) form an arithmetic progression with common difference -1.at n=33A380504