777923

Appears in sequences

• Product of twin primes of form (4*k+1,4*k+3), k>0.at n=18A071697
• Numbers k equal prime(n)*prime(n+1) such that k+1 is a square and k-1 is even semiprime.at n=12A107423
• Members of A159053 which are not multiples of 3.at n=22A159054
• Numbers n such that for any positive integers (a, b), if a * b = n then a + b is a square.at n=3A235334
• Records in A166133.at n=21A256403
• Consider numbers n such that A166133(n) sets a new record and also satisfies A166133(n)=A166133(n-1)^2-1; sequence gives values of A166133(n).at n=6A256423
• Quasi-Carmichael numbers to exactly seven bases.at n=0A257757
• Least Quasi-Carmichael number to exactly n bases.at n=6A257758
• Semiprimes p*q for which p and q are successive primes and their binary representations differ from each other in one bit position only.at n=40A261080
• Numerator of the side lengths (legs in ascending order) of the easiest Pythagorean Triangle (with smallest hypotenuse) according to the congruent numbers A003273.at n=49A268602
• Odd composites k, not powers of primes, such that for all their nontrivial unitary divisors d it holds that A347381(d) > A347381(k).at n=12A347383
• Numbers m such that the sum of its distinct prime factors and the sum of its nonprime divisors are both squares.at n=6A380953