6113744

Appears in sequences

• Start with Pascal's triangle; a(n) is the sum of the numbers on the periphery of the n-th central rhombus containing exactly 4 numbers.at n=11A081496
• a(n) is the least k>=1 such that k*(k+1) is divisible by A003418(n).at n=22A309765
• a(n) is the least k>=1 such that k*(k+1) is divisible by A003418(n).at n=23A309765