-2712

Appears in sequences

• Triangle read by rows: coefficients of the polynomial P_n(x) of degree n-1 such that P_n(j) is the j-th prime == 1 (mod A000178(n-1)) for 1<=j<=n.at n=11A279126
• a(1)=0; thereafter a(n) = (n-1)*sigma(n)-n*sigma(n-1) where sigma is the sum-of-divisors function A000203.at n=54A335153
• a(1) = 1, then subtract, multiply, and add 2, 3, 4; 5, 6, 7; ... in that order.at n=11A362270