69169

Appears in sequences

• Number of increasing sequences of addition chain type with maximal element n.at n=19A008928
• a(n) = (8*n + 7)^2.at n=32A017150
• a(n) = (9*n + 2)^2.at n=29A017186
• a(n) = (10*n + 3)^2.at n=26A017306
• a(n) = (11*n + 10)^2.at n=23A017510
• a(n) = (12*n + 11)^2.at n=21A017654
• Strobogrammatic squares: the same upside down (probably finite).at n=3A018848
• Strobogrammatic squares: the same upside down (calculator-style numerals).at n=5A018849
• Strong pseudoprimes to base 79.at n=33A020305
• Denominators of continued fraction convergents to sqrt(697).at n=6A042341
• Squares with initial digit '6'.at n=27A045789
• Numbers that are not squarefree and whose Euler totient function is squarefree.at n=42A049198
• Squares whose product of digits is also a nonzero square.at n=35A053059
• Squares composed of digits {1,6,9}.at n=6A053911
• Composite and every divisor (except 1) contains the digit 6.at n=21A062674
• Composite numbers k such that the sum of the divisors of k^2 is a prime.at n=27A065405
• Numbers k such that sigma_4(k)/sigma_2(k) is prime.at n=17A066109
• a(1) = 0, then smallest square such that a(n+1) - a(n) is a palindrome.at n=11A075056
• Perfect powers for which the two closest perfect powers are smaller.at n=38A076431
• Smaller of the two successive squares which differ in the use of only one digit.at n=28A078187