29693

Appears in sequences

• Variation of Stechkin's function, A055004.at n=18A062827
• a(n) = (A085249(n) - 1)/6.at n=30A088349
• Nonnegative walks of length n on the x-axis starting at the origin using steps {1,-1} and visiting no point more than twice.at n=31A212584
• Sequence of semiprimes with all cumulating sums being semiprime.at n=13A254325
• Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its northwest or northeast neighbor modulo 3 and the upper left element equal to 0.at n=7A266682
• T(n,k)=Number of nXk arrays containing k copies of 0..n-1 with every element equal to or 1 greater than any northeast or northwest neighbors modulo n and the upper left element equal to 0.at n=47A267019
• G.f. A(x) = Sum_{n>=0} a(n)*x^n satisfies: [Sum_{n>=0} x^n/(1 - x^(n+1))]^4 = Sum_{n>=0} a(n)*x^n/(1 - x^(n+1))^4.at n=16A341375
• a(n) = n*2^10 - 3.at n=28A362361
• Numbers k such that k^8*2^k - 1 is a prime.at n=18A367572