42849

Appears in sequences

• a(n) = (6*n+3)^2.at n=34A016946
• a(n) = (7*n + 4)^2.at n=29A017030
• a(n) = (8*n + 7)^2.at n=25A017150
• a(n) = (9*n)^2.at n=23A017162
• a(n) = (10*n + 7)^2.at n=20A017354
• a(n) = (11*n + 9)^2.at n=18A017498
• a(n) = (12*n + 3)^2.at n=17A017558
• a(n) is least k such that k and k+n are adjacent nontrivial powers of positive integers, or 0 if no such k apparently exists.at n=25A023056
• a(n) = Sum_{k=0..n+2} (k+1) * A026323(n, k).at n=8A027312
• Numbers with 15 divisors.at n=27A030633
• Numbers that are both lucky and square.at n=34A031162
• Squares with initial digit '4'.at n=19A045787
• Squares whose product of digits is also a nonzero square.at n=28A053059
• Largest square <= n^3.at n=35A065733
• Nearest integer square to n^3.at n=35A077118
• Squares whose external digits (MSD and LSD) form a square. Or squares from which deleting the internal digits leaves a square.at n=40A077356
• Squares sandwiched between two numbers divisible by squares.at n=14A088068
• A104315(n)^2.at n=6A104316
• Expansion of (4+49*x+108*x^2-432*x^3+54675*x^5)/((1-27*x^2)*(1-6*x+27*x^2)*(1+6*x+27*x^2)).at n=5A112533
• Riordan array (1/((1-4*x)*c(x)),x*c(x)/sqrt(1-4*x)), c(x) the g.f. of A000108.at n=49A113955