20651

Appears in sequences

• Brilliant numbers k such that 2k+1 is also brilliant.at n=9A085649
• Numbers k such that both k and k+2 are de Polignac numbers (A006285).at n=33A330284
• Numbers m such that A338038(m) = A338038(A004086(m)) where A004086(i) is i read backwards and A338038(i) is the sum of the primes and exponents in the prime factorization of i ignoring 1-exponents; palindromes and multiples of 10 are excluded.at n=37A338039
• Numbers m such that d(1)^1 + d(2)^2 + ... + d(p)^k = d(1)! + d(2)! + ... + d(k)!, where d(i), i=1..k, are the digits of m.at n=31A342945