70140

Appears in sequences

• Largest number k such that phi(k) = A007374(n).at n=39A224532
• Numbers k such that k+1, 2k+1, 3k+1, 4k+1 are all prime.at n=21A237189
• Triangle read by rows, T(n,k) = {n,k}*h(k), where {n,k} are the Stirling set numbers and h(k) = hypergeom([-k+1,-k],[],1), for n>=0 and 0<=k<=n.at n=33A256549
• Numbers k such that k-17, k-1, k+1 and k+17 are consecutive primes.at n=2A262176
• Numbers k sandwiched between twin primes, such that k times the reverse of k is also sandwiched between twin primes.at n=41A357076