107209

Properties

Appears in sequences

• sec(tan(arctanh(x)))=1+1/2!*x^2+21/4!*x^4+1101/6!*x^6+107209/8!*x^8...at n=4A012183
• First element of first run of at least n consecutive numbers not representable as the sum of two base-10 palindromes.at n=7A263994
• Prime numbersat n=10216