26281

Appears in sequences

• a(n) = 9^n - 8^n.at n=5A016185
• Strong pseudoprimes to base 44.at n=22A020270
• Strong pseudoprimes to base 69.at n=17A020295
• Numbers k such that the continued fraction for sqrt(k) has period 99.at n=22A020438
• a(n) = (n+1)^5 - n^5.at n=8A022521
• Difference between 3^n and highest power of 2 less than or equal to 3^n.at n=10A056577
• Difference between 2^n and the next larger or equal power of 3.at n=15A063004
• Numbers n such that n-1, n and n+1 can be expressed as a sum of 2 squares in at least 2 ways.at n=1A091459
• First differences of A006899.at n=24A108906
• a(0)=1, a(1)=1, a(n) = 9*a(n/2) for even n >= 2, and a(n) = 8*a((n-1)/2) + a((n+1)/2) for odd n >= 3.at n=31A116526
• 9^n mod 8^n.at n=5A139733
• Numbers expressible as the difference of two nonnegative fifth powers.at n=31A152045
• Difference of two positive 5th powers.at n=24A181124
• Monotonic ordering of nonnegative differences 9^i-2^j, for 40>= i>=0, j>=0.at n=36A192123
• Monotonic ordering of nonnegative differences 3^i-8^j, for 40>= i>=0, j>=0.at n=30A192155
• Number of n-ary words beginning with the first character of the alphabet, that can be built by inserting four doublets into the initially empty word.at n=13A194716
• Smallest positive integer k (or 0 if no such k) with a primitive cycle of positive integers, exactly n of which are odd, under iteration by the Collatz-like 3x-k function.at n=39A226677
• Sizes of logical groups of the same integer in A229895.at n=40A229896
• Numbers m such that the decimal number concat(8,m) is a square.at n=31A273363
• a(n) = A273059(4n+3).at n=28A275919