2222122domain: NAppears in sequencesNumbers k such that k | 5^k + 5.at n=17A015891k th digit of a(n) is the number of different digits within 4 of k (not including k).at n=29A039990Even pseudoprimes to base 29.at n=23A130439"Wondrous representation" [left to right] of positive integer n, n >= 2.at n=18A303255