42018

Appears in sequences

• Sequence of the "Natural Jewels": a natural jewel is a number that is totally enclosed by prime numbers in a version of Ulam Spiral.at n=23A172294
• (5*7^n+1)/2.at n=5A199421
• Averages q of twin prime pairs, such that q concatenated to q is also the average of a twin prime pair.at n=37A235109
• a(n) is the smallest positive integer of length (distance from origin) n in the Cayley graph of the integers generated by all powers of 7.at n=17A297180
• Number of 321-avoiding permutations of length n whose squares also avoid the pattern 321.at n=12A326761
• The excess of the number of partitions of n with more odd parts than even parts over the number of partitions of n with more even parts than odd parts.at n=46A338860
• Numbers on the square spiral board that are enclosed by four primes.at n=23A341542