27945

Appears in sequences

• Odd numbers divisible by exactly 7 primes (counted with multiplicity).at n=28A046320
• a(n) = 3*a(n-1) + 3*a(n-2), a(0)=0, a(1)=3.at n=8A106435
• Numbers of the form 56+p^2 (where p is a prime).at n=38A138690
• Numbers n such that the digits of sigma(n) are exactly the same (albeit in different order) as the digits of phi(n), in base 10.at n=29A175795
• Surface area of a certain twisted cube.at n=8A199674
• Number of 3 X n arrays of the minimum value of corresponding elements and their horizontal or vertical neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..2 3 X n array.at n=10A219596
• T(n,k)=Number of 0..k arrays of length n with each element unequal to at least one neighbor, starting with 0.at n=63A221463
• Number of (n+6)X9 0..1 matrices with each 7X7 subblock idempotent.at n=5A224583
• Number of (n+6)X12 0..1 matrices with each 7X7 subblock idempotent.at n=2A224586
• T(n,k)=Number of (n+6)X(k+6) 0..1 matrices with each 7X7 subblock idempotent.at n=30A224588
• a(n) = a(n-1) + 3*a(n-2) if n even, or 2*a(n-1) + 4*a(n-2) if n odd, starting with 0, 1.at n=12A299914
• a(n) = A299914(2n).at n=6A299915
• Decimal numbers m such that the product of the binary string of m and the binary string of m in reverse contains the binary string of m as a substring.at n=41A342130
• Nonsquare positive integers k such that k = a*b = c*m + b and b^2 = a*m + c where m > 1, 0 < a, b, c < m.at n=5A347168
• a(n) = 3*(3^(n-1) - 2^n + 1)/2 - binomial(n,2), n >= 3.at n=7A363591
• E.g.f. A(x) satisfies A(x) = exp( sin(x * A(x)) / A(x) ).at n=8A381148