27918

Appears in sequences

• Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,7.at n=27A064240
• a(n) = digit reversal of A103741(n).at n=30A103763
• a(n) = digit reversal of A103764.at n=10A103837
• Triangle related to the divergent series 1^m*1! - 2^m*2! + 3^m*3! - 4^m*4! + ... for m >= -1.at n=50A163940
• Fifth right hand column of triangle A163940.at n=5A163942
• 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=20A172294
• Numbers k such that in a rotated-square spiral with positive integers (A215468) among k's eight nearest neighbors five or more are primes.at n=13A215471
• Sum of the squared parts of the partitions of n into exactly two parts.at n=43A226141
• Triangle read by rows: T(n,m) (n >= 1, 1 <= m <= n) = number of set partitions of [n], avoiding 123454, with m blocks.at n=49A250119
• Numbers on the square spiral board that are enclosed by four primes.at n=20A341542
• Upper (1/3,1/2) midsequence of (n^2) and (n^3); see Comments.at n=38A390566