91809

Appears in sequences

• Squares of palindromes.at n=39A014186
• a(n) = (8*n + 7)^2.at n=37A017150
• a(n) = (9*n + 6)^2.at n=33A017234
• a(n) = (10*n + 3)^2.at n=30A017306
• a(n) = (11*n + 6)^2.at n=27A017462
• a(n) = (12*n + 3)^2.at n=25A017558
• Odd refactorable numbers.at n=31A036896
• Squares with initial digit '9'.at n=11A045793
• Squares which are the arithmetic mean of two consecutive primes.at n=37A069495
• Squares of the form u'v'w, where in decimal representation u=n^2, v=2*n^2 and w=n^2 possibly with a leading zero.at n=2A077432
• a(1) = 1, then least square such that every partial concatenation is a prime.at n=35A090257
• a(n) = A110722(n)/121.at n=33A110723
• Squares of the form 2*prime(n) - prime(n+1).at n=31A110970
• Numbers k such that sigma(k) + phi(k) is a brilliant number (A078972).at n=23A115916
• Numbers k such that k*(k+1) gives the concatenation of two numbers m and m+1.at n=4A116294
• Squares for which the sum of the digits are cubes.at n=33A117685
• Squares for which both the sum of the digits and the product of the digits are cubes.at n=7A117687
• RF(3): refactorable numbers with smallest prime factor 3.at n=29A120319
• Perfect powers beginning and ending with the same digit.at n=36A128827
• Squares k such that k - 2 and k + 2 are prime.at n=8A144938