255255

Appears in sequences

• 2nd elementary symmetric function of the first n+1 positive integers congruent to 2 mod 3.at n=20A024391
• Denominator of |Bernoulli(2n+2)| - |Bernoulli(2n)|.at n=24A029765
• Lucky numbers that are concatenations of a number k with itself.at n=28A032650
• Denominators of partial sums of Bernoulli numbers B_{2n} = A000367/A002445.at n=8A035077
• Smallest triangular number containing exactly n 5's.at n=3A036522
• Product of 6 successive primes.at n=1A046324
• Numbers n such that the cyclotomic polynomial of order n has a nonzero coefficient which does not appear in any cyclotomic polynomials of lower order.at n=22A046887
• Partial products of the sequence (A001097) of twin primes.at n=6A048599
• Squarefree parts of highly composite numbers (definition 1) (A002182).at n=52A062566
• Triangular numbers that contain exactly 2 different digits.at n=24A062691
• Boundaries of primorial intervals [1,3]; [3,9],[9,15]; [15,45], etc.at n=25A065917
• Triangular numbers containing 2k digits in which the sum of the first k digits = that of the rest.at n=23A068898
• Triangular numbers containing 2n digits obtained by duplicating the first n digits; i.e., triangular numbers in A020338.at n=5A068899
• One half of product of first n primes A000040.at n=6A070826
• a(n) is the smallest positive integer m for which A070194(m) (i.e., the maximal gap in {k|gcd(k,m) = 1, 1 <= k <= m-1}) is n.at n=12A070971
• Denominator of Sum_{k=1..n} phi(k)/k.at n=17A072155
• Denominator of Sum_{k=1..n} phi(k)/k.at n=16A072155
• Least multiple of n having no prime gaps.at n=50A072941
• Denominator of b(n) = Sum_{k'<=n} 1/k', where k' denotes the squarefree numbers.at n=17A072983
• Denominator of b(n) = Sum_{k'<=n} 1/k', where k' denotes the squarefree numbers.at n=16A072983