97681

Appears in sequences

• Nonprime numbers n such that phi(n) divides n^2 - 1, where phi(n) (A000010) is Euler's totient function.at n=25A098271
• Triangle W, read by rows, where column k of W = column 0 of W^(k+1) for k>=0 such that W equals the matrix cube of P = A136220 with column 0 of W = column 0 of P shift up one row.at n=22A136231
• Matrix square of triangle W = A136231; also equals P^6, where P = triangle A136220.at n=15A136235
• Partial sums of sequence A177342.at n=22A178073
• Number of 2 X n 0..2 arrays with antidiagonals unimodal and rows and diagonals nondecreasing.at n=29A224000
• Number of length 2+2 0..n arrays with the sum of the maximum minus twice the median plus the minimum of adjacent triples multiplied by some arrangement of +-1 equal to zero.at n=31A251429
• Centered octachoral numbers.at n=10A365206