30205

Appears in sequences

• Numbers whose base-4 representation contains exactly four 1's and four 3's.at n=18A045133
• Numbers n for which there are exactly seven k such that n = k + (product of nonzero digits of k).at n=4A096928
• Arithmetic mean of two consecutive prime interprimes of second order: interprimes of third order.at n=8A126556
• Expansion of 1/(1-x-x^2-x^10+x^12).at n=22A147659
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, 0, 0), (-1, 0, 1), (1, -1, 0), (1, 1, 0)}.at n=9A149271
• Numbers n with property that n^2 contains "1234" as a substring.at n=13A175464
• Partial sums of A047076.at n=1A176721
• Numbers n such that d(1)^1 + d(2)^2 + ... + d(p)^p and d(1)^p + d(2)^p-1 +... + d(p)^1 are squares, where d(i), i=1..p, are the digits of n.at n=48A178360
• Number of composites removed in each step of the Sieve of Eratosthenes for 10^7.at n=14A227155
• Number of unlabeled rooted trees with n nodes such that the minimal outdegree of inner nodes equals 5.at n=33A244459
• Number of nX3 0..1 arrays with every element unequal to 2, 3, 4, 6 or 7 king-move adjacent elements, with upper left element zero.at n=8A305170
• T(n,k)=Number of nXk 0..1 arrays with every element unequal to 2, 3, 4, 6 or 7 king-move adjacent elements, with upper left element zero.at n=57A305175
• T(n,k)=Number of nXk 0..1 arrays with every element unequal to 2, 3, 4, 6, 7 or 8 king-move adjacent elements, with upper left element zero.at n=57A316763
• Number of nonequivalent 2-column nonnegative integer matrices with column sums n and any number of nonzero rows up to permutation of rows and columns.at n=10A331722
• G.f. satisfies A(x) = exp( Sum_{k>=1} A(x^k) * x^k/(k * (1 + x^k)^2) ).at n=44A363567
• Antidiagonal sums of A366858.at n=9A366859
• Indices of the Sylvester primes (A375543) in the primes (A000040).at n=21A375545