104651

Properties

Appears in sequences

• Number of nonempty subsets of {1,2,...,n} in which exactly 1/4 of the elements are <= (n-3)/3.at n=19A048030
• Successive record-setters for tau(n+1)*tau(n-1)/tau(n)^2, where tau(n) is the number of divisors of n.at n=27A094342
• Chen primes p such that p + 2 is triangular.at n=16A109504
• Chen primes p such that their p + 2 counterpart is a Sarrus number (pseudoprime to base 2).at n=11A109994
• Primes in A128490.at n=32A128491
• Numbers whose base-10 and base-7 representations are permutations of the same multiset of digits.at n=50A130604
• Primes of the form p + (p^2 - 1)/8, where p is also prime.at n=32A165352
• Primes of the form (p^2 - 1)/8 - p, where p is also a prime.at n=35A165567
• Primes of form n^4 - n^2 - 1.at n=9A174822
• Number of n X 5 binary arrays with each 1 adjacent to exactly two 0's.at n=6A183333
• Lesser of overpseudo-twin-primes to base 2 defined in Comment.at n=1A195468
• Centered 25-gonal primes.at n=22A276264
• Primes that can be generated by the concatenation in base 8, in descending order, of two consecutive integers read in base 10.at n=32A287311
• Primes p such that d(p^2-1) sets a record, where d(n) is the number of divisors of n.at n=29A335325
• Number of wedged n-spheres in the homotopy type of the neighborhood complex of Kneser graph KG_{3,n}.at n=22A342737
• Primes of the form T(p) - 2 where T(p) is the triangular number (A000217) with prime index p in A357218.at n=25A357219
• Prime numbersat n=9989