67199

Appears in sequences

• Lucas-Carmichael numbers: squarefree composite numbers k such that p | k => p+1 | k+1.at n=19A006972
• Numbers which on adding their reversal gives perfect cubes.at n=8A080179
• a(n) = 42*n^2 - 1.at n=39A158626
• Lucas-Carmichael numbers with 3 prime factors.at n=14A216925
• Number of (n+1) X 4 0..2 matrices with each 2 X 2 subblock idempotent.at n=16A224671
• Euler elliptic Carmichael numbers for the elliptic curve y^2 = x^3 + 80.at n=24A290338
• Elliptic Carmichael numbers for the elliptic curve y^2 = x^3 + 80.at n=38A317174
• Chebyshev pseudoprimes to both base 2 and base 3: composite numbers k such that T(k, 2) == 2 (mod k) and T(k, 3) == 3 (mod k), where T(k, x) is the k-th Chebyshev polynomial of the first kind.at n=7A330208