23509

Properties

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 74 ones.at n=32A031842
• Number of unlabeled and connected graphs on n vertices which are HH-free ("house-hole-free").at n=8A079453
• Primes arising in A090510.at n=2A090511
• Primes that are a concatenation of 2, 3 and a prime.at n=17A101218
• Primes p such that p+1, p+2 and p+3 have equal number of divisors.at n=27A119711
• Primes remaining primes under map 3<=>5 (interchange of decimal digits 3 and 5).at n=33A198047
• Triangle of coefficients of polynomials v(n,x) jointly generated with A210866; see the Formula section.at n=51A210867
• Primes p such that floor(log(p)) + p^2 is prime.at n=28A225626
• a(n) = initial term of an arithmetic progression of nine primes used to form a 3 X 3 magic square with magic sum A269324(n).at n=18A269325
• Number A(n,k) of tilings of a k X n rectangle using monominoes and trominoes of any shape; square array A(n,k), n>=0, k>=0, read by antidiagonals.at n=48A270061
• Number A(n,k) of tilings of a k X n rectangle using monominoes and trominoes of any shape; square array A(n,k), n>=0, k>=0, read by antidiagonals.at n=51A270061
• Number of tilings of a 3 X n rectangle using monominoes and trominoes of any shape.at n=6A270063
• Number of tilings of a 6 X n rectangle using monominoes and trominoes of any shape.at n=3A270066
• Primes p such that, if q is the next prime, p + q^2 is a prime times a power of 10.at n=22A352837
• Prime numbersat n=2614