23115

Appears in sequences

• a(n) is the concatenation of n and 5n.at n=22A019553
• Numbers k such that the decimal part of k^(1/10) starts with a 'nine digits' anagram.at n=8A034285
• Numbers n such that phi((prime(n)+1)/2)=sigma(n).at n=36A068473
• Numbers n with property that for each single digit d of n, we can also see the decimal expansion of the d-th prime as a substring of n. Also n may not contain any zero digits.at n=8A135015
• Triangle read by rows: a(1,1)=1. a(m,n) = a(m-1,n) + (sum of all terms in row m-1), for n<m. a(m,m) = sum of all terms in row m-1.at n=30A159930
• Half the number of nXnXn triangular binary arrays with no element equal to a strict majority of its neighbors.at n=5A183283
• Number of 4X2 integer matrices with each row summing to zero, row elements in nondecreasing order, rows in lexicographically nondecreasing order, and the sum of squares of the elements <= 2*n^2 (number of collections of 4 zero-sum 2-vectors with total modulus squared not more than 2*n^2, ignoring vector and component permutations).at n=33A192703
• Number of partitions p of n such that (number of distinct parts of p) < max(p) - min(p).at n=38A239954
• Expansion of 1/(1 - Sum_{k>=0} x^(2*k*(k+1)+1)).at n=37A282504
• Least number m such that A323835(m) = n.at n=60A306304