42456
domain: N
Appears in sequences
- a(n) = Sum_{m=1..n} Sum_{k=1..m} prime(k).at n=40A014148
- Positive numbers k such that (k+1)*(k+2)*(k+3)*(k+4)/(k+(k+1)+(k+2)+(k+3)+(k+4)) is an integer.at n=34A032795
- Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,37.at n=7A064255
- a(n) = k*a(n-1) + a(n-2) where k = A003842(a); a(0) = 1.at n=17A108282
- Numbers k such that k*Lucas(k) + 1 is prime.at n=32A134696
- a(n) = Sum_{k=1..n-1} sigma(k) * sigma_2(n-k).at n=22A374974