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 A220516 Nonnegative integers in square maze arrangement T(n,k), read by antidiagonals, n>=0, k>=0. 3
 0, 1, 3, 8, 2, 4, 9, 7, 5, 15, 24, 10, 6, 14, 16, 25, 23, 11, 13, 17, 35, 48, 26, 22, 12, 18, 34, 36, 49, 47, 27, 21, 19, 33, 37, 63, 80, 50, 46, 28, 20, 32, 38, 62, 64, 81, 79, 51, 45, 29, 31, 39, 61, 65, 99, 120, 82, 78, 52, 44, 30, 40, 60, 66, 98, 100 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS This sequence consists of 0 together with a permutation of the natural numbers. The structure is the same as A081344 but starting with 0, not 1. It appears that in the n-th layer there is at least a prime number <= g and also there is at least a prime number > g, where g is the number on the main diagonal, the n-th oblong number A002378(n), if n >= 1. LINKS FORMULA a(n) = A081344(n+1) - 1. T(n,k) = n^2 + k     , if n is odd  and k<=n. T(n,k) = n(n + 2) - k, if n is even and k<=n. T(n,k) = k(k + 2) - n, if n is odd  and n

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Last modified July 24 23:25 EDT 2021. Contains 346273 sequences. (Running on oeis4.)