73441

Appears in sequences

• a(n) = (7*n + 5)^2.at n=38A017042
• a(n) = (8*n + 7)^2.at n=33A017150
• a(n) = (10*n + 1)^2.at n=27A017282
• a(n) = (11*n + 7)^2.at n=24A017474
• a(n) = (12*n + 7)^2.at n=22A017606
• Squares which are palindromes in base 15.at n=18A030075
• Squares with initial digit '7'.at n=14A045791
• Composite numbers k such that sigma(k) / d(k) is prime.at n=33A048969
• Numbers k such that k + 1 has one more divisor than k.at n=31A055927
• Numbers of the form Sum_{j=1..k} sigma(j) that are square.at n=4A062407
• Squares that are the concatenation of three numbers, one of which is the sum of the other two.at n=11A062555
• a(n) = n*(n+1)*(n+2)*(n+3)+1 = (n^2 + 3*n + 1)^2.at n=15A062938
• Numbers n such that sigma(d(n^3))==d(sigma(n^2)), where d(n) is the number of divisors of n.at n=19A063797
• Squares which when reversed are primes (ignore leading zeros).at n=23A068989
• a(n) = A073145(n)^2.at n=17A073702
• Nonprimes in A078447.at n=10A078877
• Squares of primes of the form 4*k+3.at n=30A087691
• Perfect powers whose digit reversal is prime.at n=26A088112
• Sum of legs of primitive Pythagorean triangles having legs that add up to a square, sorted on hypotenuse.at n=31A089552
• Member r=18 of the family of Chebyshev sequences S_r(n) defined in A092184.at n=5A098303