25281

Appears in sequences

• Tribonacci numbers: a(n) = a(n-1) + a(n-2) + a(n-3) with a(0)=a(1)=a(2)=1.at n=18A000213
• arcsin(sinh(x)+arctan(x))=2*x+7/3!*x^3+273/5!*x^5+25281/7!*x^7...at n=3A013058
• a(n) = (5*n + 4)^2.at n=31A016898
• a(n) = (6*n+3)^2.at n=26A016946
• a(n) = (7*n + 5)^2.at n=22A017042
• a(n) = (8*n + 7)^2.at n=19A017150
• a(n) = (9*n + 6)^2.at n=17A017234
• a(n) = (10*n + 9)^2.at n=15A017378
• a(n) = (11*n + 5)^2.at n=14A017450
• a(n) = (12*n + 3)^2.at n=13A017558
• Smallest nontrivial extension of n-th palindrome which is a square.at n=33A030676
• Squares of lucky numbers.at n=32A032598
• Consider the sequence of 4-tuples {0,a,b,c} (c>=a+b; a,b,c>0) which have the smallest integer 'c' required to reach {k,k,k,k} in n steps under map {r,s,t,u}->{|r-s|,|s-t|,|t-u|,|u-r|}. This sequence gives the second term 'a' of these quadruples.at n=30A034803
• Consider the sequence of 4-tuples {0,a,b,c} (c>=a+b; a,b,c>0) which have the smallest integer 'c' required to reach {k,k,k,k} in n steps under map {r,s,t,u}->{|r-s|,|s-t|,|t-u|,|u-r|}. This sequence gives the third term 'b' of these quadruples.at n=28A034804
• Odd refactorable numbers.at n=19A036896
• Square refactorable numbers.at n=24A036907
• Square numbers that are concatenations of two or more prime numbers.at n=23A038692
• Squares with initial digit '2'.at n=31A045785
• sigma(n)-n is a perfect square associated with A049226.at n=12A049228
• Number of positive integers <= 2^n of form 3 x^2 + 7 y^2.at n=18A054164