20439
domain: N
Appears in sequences
- Numbers m such that m divides 10^m - 1.at n=18A014950
- a(n) = n^3 + n^2 + n.at n=27A027444
- Smallest solution to 10^m == 1 (mod m) having the prime divisor A066364(n).at n=3A114207
- Numbers k such that k and 4*k, taken together, are pandigital.at n=4A115924
- Column 4 of triangle A123610.at n=8A123614
- First differences of A006128.at n=32A138137
- a(0) = 6, a(1) = 17, a(n+1) = a(n) + a(n-1) for n>0.at n=16A166025
- a(n) = 5*2^(n-1) - 2 - 3*n.at n=12A213387
- a(n) = n^3 + 3*n + 3^n.at n=9A220509
- Sum of the cubes of the divisor complements of the odd proper divisors of n.at n=26A352049
- Odd numbers k such that A173557(k) = A173557(sigma(k)), where A173557(n) is multiplicative with a(p^e) = p-1 and sigma is the sum of divisors function.at n=23A387159
- Number of fixed polyiamonds of area n with holes.at n=13A389190