18655

Appears in sequences

• Ruth-Aaron numbers (1): sum of prime divisors of n = sum of prime divisors of n+1.at n=21A006145
• Number of nonempty subsets of {1,2,...,n} in which exactly 2/5 of the elements are <= (n-2)/3.at n=18A048022
• Number of nonempty subsets of {1,2,...,n} in which exactly 2/5 of the elements are <= (n-3)/3.at n=18A048033
• Numbers k such that sopfr(k) = sopf(k+1), where sopf(k) = A008472(k) and sopfr(k) = A001414(k).at n=16A064675
• Where A098650 reaches a record.at n=10A098651
• Partial sums of A000960.at n=40A099074
• Structured triakis icosahedral numbers (vertex structure 4).at n=12A100172
• Integers that are Rhonda numbers to base 14.at n=1A100972
• Integers that are Rhonda numbers to more than one base.at n=37A100988
• Positive numbers y such that y^2 is of the form x^2+(x+833)^2 with integer x.at n=35A156835
• a(n) = 36*n^2 - 17*n + 2.at n=22A157265
• Triangle read by rows: T(n,k) is the number of permutations of [n] having k blocks of even length.at n=20A180194
• Total number of parts of multiplicity 7 in all partitions of n.at n=43A222707
• Numbers k such that k!*2^k + 1 is prime.at n=4A256594
• Numerators of coefficients of z^n/n! for the expansion of Fricke's hypergeometric function F_1(1/2,1/2;z).at n=4A274653
• Numerators of coefficients of z^n for the expansion of Fricke's hypergeometric function F_1(1/2,1/2;z).at n=4A274655
• A(n,k) is the n-th Rhonda number to base A002808(k), the k-th composite number; square array A(n,k), n>=1, k>=1, read by antidiagonals.at n=29A291925
• Smallest positive integer whose smallest coprime divisor shift is n.at n=31A366219