31195

Appears in sequences

• Strong pseudoprimes to base 84.at n=14A020310
• Triangle, read by rows, given by [0,1,1,1,1,1,1,1,...] DELTA [1,0,1,0,2,0,3,0,4,0,5,0,6,0,...] where DELTA is the operator defined in A084938.at n=57A173050
• Numbers k such that phi(k) = phi'(k'), where phi(k) is the Euler totient function of k and k' is the arithmetic derivative of k.at n=4A260962
• Number of nX3 0..1 arrays with every element equal to 0, 2, 3, 5, 6 or 8 king-move adjacent elements, with upper left element zero.at n=11A299453
• Number of integer partitions of n with no adjacent parts having quotient > 2.at n=45A342094