44639

Appears in sequences

• Numbers k such that the value pi(k), the number of primes <= k, can be obtained deleting some of the repeating adjacent digits of k.at n=4A113898
• Numbers of the form 49*k, where 49*k+2 and 49*k-6 are both prime.at n=15A153779
• Numbers k whose decimal representation ends with that of pi(k) (where pi denotes the prime counting function A000720).at n=15A306572