18791

Appears in sequences

• Numbers whose set of base-11 digits is {1,3}.at n=41A032918
• Truncated triangular pyramid numbers: a(n) = (n-5)*(n^2 + 8*n - 66)/6.at n=42A051939
• Numbers n such that 3*10^n + R_n + 8 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=5A102965
• Position of largest coefficient of n-th self-composition of (x+x^2) for n>=0.at n=15A122893
• a(n) = 58*n^2 - 1.at n=17A158668
• Multiples of 23 whose digit reversal - 1 is also a multiple of 23.at n=35A166400
• Numbers k such that Sum_{i=1..k} i^7 divides Product_{i=1..k} i^7.at n=19A166607
• Smallest k such that 33^k mod k = n.at n=34A178194
• Collatz trajectory starting at 3711.at n=8A179623
• Numbers k such that (Sum of totatives of k) == 1 (mod Sum of primes dividing k with multiplicity).at n=40A340299
• Number of compositions (ordered partitions) of n into at most 6 nonprime parts.at n=39A347799
• G.f. A(x) satisfies A(x) = 1 / ((1 + x) * (1 - x * A(x^4))).at n=55A367694