100072
domain: N
Appears in sequences
- Numbers k such that (10^(2*k+1) + 36*10^k - 1)/9 is prime.at n=12A107125
- Write n in binary and interpret as a decimal number; a(n) is this quantity minus n.at n=38A228071
- Write n in binary and interpret as a decimal number; a(n) is this quantity minus n.at n=39A228071
- a(n) = Sum_{k=1..n} k * floor(n/k)^3.at n=39A350108