38801

Appears in sequences

• Pentagonal numbers (A000326) whose digit reversal is a prime.at n=25A115707
• Partial sums of A151782.at n=38A151793
• Number of different fixed (possibly) disconnected tetrominoes bounded tightly by an n X n square.at n=9A163434
• Relative of Hofstadter Q-sequence: a(n) = max(0, n+19395) for n <= 0; a(n) = a(n-a(n-1)) + a(n-a(n-2)) + a(n-a(n-3)) for n > 0.at n=23A283886
• Number of connected induced subgraphs in the n-Apollonian network.at n=2A298123
• Odd composite integers m such that U(m)^2 == 1 (mod m) and V(m) == 4 (mod m), where U(m) and V(m) are the m-th generalized Lucas and Pell-Lucas numbers of parameters a=4 and b=-1, respectively.at n=40A337627
• Odd composite integers m such that U(m)^2 == 1 (mod m) and V(m) == 7 (mod m), where U(m) and V(m) are the m-th generalized Lucas and Pell-Lucas numbers of parameters a=7 and b=-1, respectively.at n=39A337630
• Odd composite integers m such that A000032(3*m-J(m,5)) == 3*J(m,5) (mod m), where J(m,5) is the Jacobi symbol.at n=36A339724
• Odd composite integers m such that A000045(3*m-J(m,5)) == 1 (mod m), where J(m,5) is the Jacobi symbol.at n=40A340235
• Pentagonal numbers which are products of three distinct primes.at n=38A381650