104977

Appears in sequences

• a(n) = n^4 + 1.at n=18A002523
• Expansion of e.g.f. sec(sin(x)*exp(x))=1+1/2!*x^2+6/3!*x^3+25/4!*x^4+140/5!*x^5...at n=8A012293
• Strong pseudoprimes to base 18.at n=33A020244
• Strong pseudoprimes to base 40.at n=34A020266
• Brilliant numbers (A078972) whose digit reversal is a pentagonal number (A000326).at n=14A115679
• 17 followed by the base-18 Fermat numbers.at n=3A178424
• Semiprimes of the form n^4 + 1.at n=10A186688
• a(0)=0, a(1)=1, a(2n)=18*a(n), a(2n+1)=a(2n)+1.at n=17A197352
• Numbers of the form n^2 + 1 without prime divisors of the form a^2 + 1.at n=33A217279
• a(n) = 1 + sigma(n)^4.at n=9A259308
• a(n) = 1 + sigma(n)^4.at n=16A259308
• Numbers m such that m' = d_1^k + d_2^(k-1) + ... + d_k^1 where d_1, d_2, ..., d_k are the digits of m, with MSD(m) = d_1 and LSD(m) = d_k, and m' is the arithmetic derivative of m.at n=5A284813
• a(n) = Sum_{d|n} phi(d)^4.at n=18A342470
• a(n) is the number whose base-(n+1) expansion equals the binary expansion of n.at n=16A356274
• Values of terms in A380837 which are not in A379066.at n=35A380838