49729

Appears in sequences

• Squares formed by concatenating other squares, not ending in 0.at n=30A009404
• Crystal ball sequence for squashed {D_5}^* lattice, perhaps the smallest example of a "non-superficial" lattice.at n=9A010025
• a(n) = (6*n + 1)^2.at n=37A016922
• a(n) = (8*n + 7)^2.at n=27A017150
• a(n) = (9*n + 7)^2.at n=24A017246
• a(n) = (10*n + 3)^2.at n=22A017306
• a(n) = (11*n + 3)^2.at n=20A017426
• a(n) = (12*n + 7)^2.at n=18A017606
• Strong pseudoprimes to base 69.at n=23A020295
• Erroneous version of A039686.at n=11A038628
• Squares which are the concatenation of two nonzero squares.at n=13A039686
• Squares with initial digit '4'.at n=35A045787
• Composite numbers k such that sigma(k) / d(k) is prime.at n=29A048969
• Numbers that are not squarefree and whose Euler totient function is squarefree.at n=37A049198
• Squares of primes lacking the digit zero in their decimal expansion.at n=36A052043
• Prime powers p^w (w >= 2) such that p^w-2 is prime.at n=30A053704
• Powers of a prime lucky number (A031157) but excluding lucky numbers (A000959).at n=19A057609
• Squares whose external digits (MSD and LSD) form a square. Or squares from which deleting the internal digits leaves a square.at n=43A077356
• Numerator for global rational approximations.at n=8A079557
• Squares of primes of the form 4*k+3.at n=25A087691