66653

Properties

Appears in sequences

• First prime in n-th group in A077280.at n=7A077282
• a[n] is the largest prime before A002280[n] repdigits.at n=4A099666
• Beastly primes (version 2): primes containing 666 as a substring.at n=9A131645
• Primes of the form 14 n^2-1.at n=18A143832
• Number of tilings of an 8 X n rectangle using straight (3 X 1) trominoes and 2 X 2 tiles.at n=8A219972
• Number of tilings of an n X n square using straight (3 X 1) trominoes and 2 X 2 tiles.at n=8A219975
• Numbers k such that 4*10^k + 21 is prime.at n=28A276047
• One third the number of solid partitions of n with 5 parts.at n=41A387998
• Prime numbersat n=6645