31684

Appears in sequences

• a(n) = (prime(n) - 1)^2.at n=40A005722
• a(n) = (5*n + 3)^2.at n=35A016886
• a(n) = (6*n + 4)^2.at n=29A016958
• a(n) = (7*n + 3)^2.at n=25A017018
• a(n) = (8*n + 2)^2.at n=22A017090
• a(n) = (9*n + 7)^2.at n=19A017246
• a(n) = (10*n + 8)^2.at n=17A017366
• a(n) = (11*n + 2)^2.at n=16A017414
• a(n) = (12*n+10)^2.at n=14A017642
• Numbers k such that phi(k) + sigma(k) is a prime.at n=43A038344
• Squares with initial digit '3'.at n=16A045786
• Squares whose product of digits is also a nonzero square.at n=23A053059
• a(1) = 1; a(n) is smallest square > a(n-1) such that a(n) + a(n-1) is a prime.at n=33A062067
• a(n) = 4*prime(n)^2.at n=23A069262
• Let m = Wonderful Demlo number A002477(n); a(n) = square of the sum of digits of m.at n=21A080150
• Perfect powers which have the form prime(n) - n for some n.at n=27A107608
• Squares whose digit reversal is a brilliant number (A078972).at n=16A115667
• Powerful(1) numbers (A001694) whose digit reversal is a brilliant number (A078972).at n=20A115676
• Squares which can be represented as the sum of consecutive primes in more than one way.at n=14A163246
• Squares that are a sum of two Fibonacci numbers plus the square of a Fibonacci number.at n=28A179459