70020

Appears in sequences

• Numbers whose base-4 representation has exactly 9 runs.at n=27A043600
• Numbers n such that number of runs in the base 4 representation of n is congruent to 0 mod 9.at n=27A043858
• Numbers k such that number of runs in the base 4 representation of k is congruent to 9 mod 10.at n=27A043876
• Numbers such that the decimal digits of sigma(n) are a permutation of those of sigma(n)-n.at n=27A277114
• Decimal representation of the diagonal from the corner to the origin of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 30", based on the 5-celled von Neumann neighborhood.at n=37A285538
• Number of multisets of nonempty words with a total of n letters over octonary alphabet such that within each prefix of a word every letter of the alphabet is at least as frequent as the subsequent alphabet letter.at n=11A293738
• On a spirally numbered square grid, with labels starting at 1, this is the number of steps that an (n,n+1) leaper makes before getting trapped, or -1 if it never gets trapped.at n=27A343178
• Number of integer partitions of n with at least one part of odd multiplicity that is not the first or last.at n=44A349061
• Numbers k such that k and k+1 have the same sum of powerful divisors (A183097) and this sum is larger than 1.at n=20A349063
• Number of chordless cycles (of length >=4) in the complement of the n-polygon diagonal intersection graph.at n=7A364943
• a(n) = Sum_{k=1..n} sigma(n*k).at n=35A372710
• Primitive terms of A388022: numbers k that satisfy sigma(k) AND 3*k = 3*k, but none of whose proper divisors satisfy the same condition.at n=17A388025