40991

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 23 ones.at n=32A031791
• n-th 4k+1 prime times n-th 4k-1 prime.at n=21A048630
• Positions of sevens (ground states) in A084451.at n=28A084449
• Number of primes < prime(n)^3.at n=21A086688
• Numbers k with squares that are concatenations k^2 = x//y such that x is an anagram of y.at n=11A162945
• Composite numbers which contain their sum of aliquot parts as a substring.at n=13A225417
• a(n) is the least k such that A330241(k) = n.at n=18A329773