73124

Appears in sequences

• Numbers k such that phi(k) = phi(k+1).at n=35A001274
• Numbers k such that k divides the (k+1)st Lucas number.at n=11A094397
• A number n is included in the sequence if and only if the n-th integer from among those positive integers which are coprime to n+1 = the (n+1)-st integer from among those positive integers which are coprime to n.at n=13A139766
• Triangle read by rows: order of all-2s configuration on the n X k sandpile grid graph.at n=44A256045
• Main diagonal of A256045: order of all-2s configuration on the n X n sandpile grid graph.at n=9A256046
• a(n) = A256046(2n+1): order of all-2s configuration on the (2n+1) X (2n+1) sandpile grid graph.at n=4A256047
• Even composite integers m such that U(m)^2 == 1 (mod m) and V(m) == 3 (mod m), where U(m)=A001906(m) and V(m)=A005248(m) are the m-th generalized Lucas and Pell-Lucas numbers of parameters a=3 and b=1, respectively.at n=14A337777