29539

Appears in sequences

• Pseudoprimes to base 5.at n=38A005936
• Strong pseudoprimes to base 5.at n=10A020231
• Strong pseudoprimes to base 12.at n=19A020238
• Strong pseudoprimes to base 25.at n=22A020251
• Strong pseudoprimes to base 29.at n=18A020255
• Strong pseudoprimes to base 60.at n=16A020286
• Strong pseudoprimes to base 93.at n=22A020319
• s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = (Lucas numbers), t = A001950 (upper Wythoff sequence).at n=22A024475
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 41 ones.at n=7A031809
• Heptagonal numbers A000566 which are the sum of two other heptagonal numbers > 0.at n=12A133251
• Overpseudoprimes to base 5.at n=6A141390
• Main diagonal of array mentioned in A113941.at n=4A159190
• Numbers n such that prime(n) + reversal(prime(n)) is a square.at n=22A227371
• Heptagonal numbers (A000566) that are semiprimes (A001358).at n=20A259676
• Euler pseudoprimes to base 5: composite integers such that abs(5^((n - 1)/2)) == 1 mod n.at n=21A262052
• a(n) = prime(n) * prime(2n).at n=28A319613
• Nonprime Heinz numbers of multiples of triangular partitions, or of finite arithmetic progressions with offset 0.at n=38A325407
• Number of maximal subsets of {1..n} containing n such that every ordered pair of distinct elements has a different difference.at n=36A325880
• Heptagonal numbers (A000566) with prime indices (A000040).at n=28A346494
• a(n) = Sum_{k=1..n} (-1)^(k+1) * floor((n/k)^3).at n=31A350222