383838

Appears in sequences

• Numbers whose consecutive digits differ by 5.at n=48A048407
• Smallest multiple of n using all digits of (n-1) with the same frequency and no others; or 0 if no such number exists.at n=38A083959
• G.f. satisfies: A(x) = (1 + x*A(x)^(3/2))^4.at n=6A212073
• Least positive integer k such that 5^n-1 and k^n-1 are relatively prime.at n=35A270360
• Denominators for generalized Bernoulli numbers B[5,j](n), for j=1..4, n >= 0.at n=36A288872
• List of numbers k whose consecutive digits increase or decrease by d-1, where d is the number of digits in k.at n=108A292439
• Denominators of coefficients in expansion of e.g.f. x / (1 + 2*x - exp(x)).at n=36A347427
• Numbers that are the concatenation of two palindromes and that have exactly two palindromic factors, all with the same number of decimal digits.at n=36A355148
• Products of 6 distinct primes that are sandwiched between twin prime numbers.at n=19A378097
• a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/5)} a(5*k) * a(n-1-5*k).at n=33A386379