48481

Properties

Appears in sequences

• sech(sin(tanh(x)))=1-1/2!*x^2+17/4!*x^4-673/6!*x^6+48481/8!*x^8...at n=4A012050
• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 48.at n=1A031636
• Primes of the form 16*m^2 + 81, m=1,2,3,...at n=10A087861
• Smallest prime whose product of digits is an n-th power.at n=9A089364
• Smallest prime whose product of digits is 2^n.at n=10A089365
• Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1100-0111-0001 pattern in any orientation.at n=15A147281
• Primes formed by concatenating k, k, and 1 for k >= 1.at n=12A210511
• Fundamental discriminants d uniquely characterizing all complex biquadratic fields Q(sqrt(-3),sqrt(d)) which have 3-class group of type (3,3) and second 3-class group isomorphic to either SmallGroup(2187,247)-#1;5 or SmallGroup(2187,247)-#1;9.at n=17A250242
• Primes of the form n^2 + 81.at n=20A256775
• Primes having only {1, 4, 8} as digits.at n=19A260270
• Prime numbersat n=4987