33413

Properties

Appears in sequences

• Numbers k that divide the (left) concatenation of all numbers <= k written in base 21 (most significant digit on left).at n=13A029490
• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 21.at n=11A031609
• Sixth term of strong prime sextets: p(m-4)-p(m-5) > p(m-3)-p(m-4) > p(m-2)-p(m-3) > p(m-1)-p(m-2) > p(m)-p(m-1).at n=9A054818
• Primes with 3 distinct digits that remain prime (no leading zeros allowed) after deleting all occurrences of any one of its distinct digits.at n=32A057879
• Primes p such that p+1, p+2 and p+3 have equal number of divisors.at n=34A119711
• Lesser of two Pythagorean primes for which the Pythagorean triangles have the same area.at n=18A157184
• Smallest prime p such that the sum of the squares of the digits of p equals n (or 0 if no such prime exists).at n=43A187553
• Primes having only {1, 3, 4} as digits.at n=41A199341
• Primes of the form 2k^2 + k + 2.at n=21A249606
• Prime numbersat n=3579