43693

Appears in sequences

• Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 23.at n=28A051988
• Cototient of 2^n + 1.at n=17A053286
• Numbers n such that C(4n,n)/(3n+1) (A002293) is not divisible by 4.at n=38A078971
• a(n) = (7 - 4*(-2)^n)/3.at n=15A083594
• Triangle of sums of Jacobsthal numbers related to binomial(4n,n)/(3n+1) mod 4.at n=29A113049
• Jacobsthal numbers A001045 incremented by 2.at n=17A153643
• First differences of A135351.at n=19A155980
• a(n) = (2*2^n+7*(-1)^n)/3.at n=16A171382
• a(n) = (2*4^n + 7)/3.at n=8A321358
• Number of integer partitions of n such that either the run-lengths or the negated run-lengths are unimodal.at n=43A332746
• a(n) is the largest number whose sixth power is an n-digit sixth power which has the maximum sum of digits (A373994(n)).at n=27A380193
• a(n) = k the least number for which k^6 is n digits long and the sum of digits of k^6 is the maximum possible for a 6th power of that length (A373994(n)).at n=27A380567