180225

Appears in sequences

• a(n) = 11*2^n + 1.at n=14A083683
• Rows of A114000 expressed as decimals (a sequence related to the number of divisors of 2n-1).at n=17A114001
• Numbers k such that the concatenation of k with 4*k gives a square.at n=28A115535
• a(n) = 2*a(n-1) - 1 for n>1, a(1)=23.at n=13A122041
• Vampire numbers permutations of whose digits are other vampire numbers.at n=21A167266
• a(n) = 11*4^n + 1.at n=7A199211
• Number of 2 X 2 matrices having all elements in {-n,..,0,..,n} with determinant = permanent.at n=22A280059
• Composite numbers k such that A003958(k) divides k-1.at n=18A340093