181476

Appears in sequences

• a(n) = (11*n + 8)^2.at n=38A017486
• Squares in which parity of digits alternates.at n=41A030152
• Even squares in which parity of digits alternates.at n=15A030158
• Smallest nontrivial extension of n-th palindrome which is a square.at n=26A030676
• Smallest nontrivial extension of n-th palindromic prime which is a square.at n=8A030681
• Denominator of 1/36 - 1/n^2.at n=70A061046
• Smallest square that contains the digits of n in its exact middle.at n=14A062689
• Squares whose external digits form a square and whose internal digits form a prime.at n=8A076395
• E.g.f: exp(x/(1-5*x))/sqrt(1-25*x^2).at n=5A115332
• a(n) = (n+1)*(2n+1)^2.at n=35A139757
• Antidiagonal triangle sequence based on recursion: f(n,a)=a*n*f(n-1,a)+f(n-2,a).at n=42A173003
• Numbers k such that k^k == 1 (mod sigma(k)).at n=20A181476
• Numbers n such that the product of n and the sum of the reciprocal of their anti-divisors is an integer.at n=20A272890
• Squares that are also pentagonal pyramidal numbers.at n=6A277792
• Numbers n such that 2^n == 1 (mod sigma(n)).at n=35A278836
• Primitive exponential abundant numbers: the powerful terms of A129575.at n=35A328136
• Primitive exponential unitary abundant numbers: the powerful terms of A383693.at n=32A383694
• Primitive exponential squarefree exponential abundant numbers: the powerful terms of A383697.at n=29A383698
• Detour index of the n X n black bishop graph.at n=11A387645
• Primitive exponential Zumkeller numbers: powerful numbers whose exponential divisors can be partitioned into two disjoint subsets of equal sum.at n=39A391087