38123

Appears in sequences

• Numbers n such that the sum of the digits of the n-th Fibonacci number written in bases 2, 3, 5 and 7 is prime.at n=40A111064
• Semiprimes in A054552.at n=34A113690
• a(0)=1. a(n) = a(n-1) + (largest integer occurring among {a(0),a(1),a(2),...,a(n-1)} that is coprime to n).at n=23A120938
• Second differences of sequence A160644.at n=44A160648
• Numbers k such that Sum_{i=1..k} (i-tau(i))^i == 0 (mod k), where tau(i) = A000005(i), the number of divisors of i, and i-tau(i) = A049820(i).at n=10A229210
• Numbers n such that sopfr(n) = sopfr(n-1) + sopfr(n-2), where sopfr is the sum of prime factors of n with multiplicity (A001414).at n=8A294995
• Position k of first term in a run of odd terms with length > 1 in A093714.at n=6A351498