111705

Appears in sequences

• Numbers k such that 70*R_k + 1 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=15A056688
• Triangle of coefficients of a companion polynomial to the Gandhi polynomial.at n=17A083061
• Another version of triangular array in A083061: triangle T(n,k), 0<=k<=n, read by rows; given by [0, 1, 3, 6, 10, 15, 21, 28, ...] DELTA [1, 2, 3, 4, 5, 6, 7, 8, ...] where DELTA is the operator defined in A084938.at n=24A094665
• Fourth right hand column of triangles A094665 and A083061.at n=2A160471