18872

Appears in sequences

• Expansion of (phi(-q^5) / phi(-q))^2 in powers of q where phi() is a Ramanujan theta function.at n=13A138517
• Number of values generated by the algorithm given as first comment.at n=16A181533
• a(n) = n*(2^n - n + 1) + 2^(n-1)*(n^2 - 3*n + 2).at n=8A191821
• Number of n X 4 0..1 arrays with rows and columns lexicographically nondecreasing read forwards, and nonincreasing read backwards.at n=20A201371
• Total sum of parts of multiplicity 10 in all partitions of n.at n=43A222738
• Integer lengths of log(2)-primes: numbers n such that the concatenation of the first n decimal digits of log(2) is prime.at n=4A228226
• Smallest even k such that lpf(k-1) = prime(n), while lpf(k-3) > prime(n), where lpf=least prime factor (A020639).at n=28A242489
• a(n) = Sum_{m=0..floor((n-1)/2)} prime((n-m)(n-m-1)/2+m+1).at n=26A249490
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 141", based on the 5-celled von Neumann neighborhood.at n=30A270284
• a(n) = sigma(A291789(n)).at n=14A291804
• Numbers that cannot be expressed as the sum of one or more numbers without any repeated digits.at n=0A342080
• Number of subsets of {1..n} whose greatest element can be written as a (strictly) positive linear combination of the others.at n=34A365043