27987

Appears in sequences

• Number of binary rooted trees with n nodes and height exactly 12.at n=19A036601
• Number of primitive (aperiodic) reversible strings with n beads using exactly three different colors.at n=9A056319
• a(n) = smallest number k such that 2^n + k is a palindrome.at n=34A083463
• Poincaré series for hyperbolic reflection group with Coxeter diagram shown in Comments.at n=14A265052
• Numbers k such that (94*10^k + 11)/3 is prime.at n=20A280019
• a(n) is the lowest number in the sequence of the first occurrence of exactly n consecutive numbers with at least one repeated digit, or -1 if no such number exists.at n=25A337707
• Consecutive states of the linear congruential pseudo-random number generator (31481*s+21139) mod 10^5 when started at s=1.at n=14A384341