18430

Appears in sequences

• Numbers k such that sigma(k) = sigma(k+6).at n=38A015866
• Sequence associated to the recurrence b(n) = b(n-1) + 3*b(n-2).at n=5A110111
• Square array of numbers associated to the recurrences b(k) = b(k-1) + n*b(k-2); array T(n,k), read by descending antidiagonals, for n, k >= 0.at n=31A110112
• Triangle, T(n, k) = (1/2)*(n+2)! * [x^k]( p(x, n) ), where p(x,0) = 1, p(x,1) = -x, P(x, n) = (1/(n+1))*( (2*n-x)*P(x, n-1) - n*P(x, n-2) ), read by rows.at n=42A136532
• a(n) = n*(16*n^2 + 3*n - 13)/6.at n=19A172078
• Triangle t(n,k) read by rows: fibonomial ratios c(n)/(c(k)*c(n-k)) where c are partial products of a generalized Fibonacci sequence with multiplier m=3.at n=31A172347
• Triangle t(n,k) read by rows: fibonomial ratios c(n)/(c(k)*c(n-k)) where c are partial products of a generalized Fibonacci sequence with multiplier m=3.at n=32A172347
• a(n) = 9*2^n - 2.at n=11A176449
• Sums of two successive primes s such that s+-3 are primes.at n=33A179485
• Number of n X 3 0..1 arrays avoiding the patterns 0 1 0 or 1 0 1 in any row, column, diagonal or antidiagonal.at n=8A206982
• Number of (w,x,y) with all terms in {0,...,n} and 2|w-x| >= max(w,x,y)-min(w,x,y).at n=29A213388
• -2-Knödel numbers.at n=28A225506
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 43", based on the 5-celled von Neumann neighborhood.at n=29A269878
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 163", based on the 5-celled von Neumann neighborhood.at n=29A270455
• Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 621", based on the 5-celled von Neumann neighborhood.at n=14A283357
• Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 637", based on the 5-celled von Neumann neighborhood.at n=14A283406
• Start with a(1) = 1 and apply certain patterns of operations on a(n-1) to obtain a(n) as described in comments.at n=44A309523
• a(n) = prime(n)*(prime(n-1) + prime(n+1)).at n=23A357679