20807

Properties

Appears in sequences

• Solid partitions of n which are restricted to two planes.at n=14A002835
• M-sequences from multicomplexes on 4 variables with all monomials of degree 3 but none of degree larger than n.at n=6A011811
• Primes that remain prime through 2 iterations of function f(x) = 8x + 1.at n=36A023260
• Numbers k such that 51*2^k+1 is prime.at n=37A032375
• Denominators of continued fraction convergents to sqrt(131).at n=6A041239
• Smaller of twin prime pairs in consecutively larger seas of composite numbers.at n=27A046928
• Numbers n such that 169*2^n-1 is prime.at n=20A050836
• Numbers k such that k^4 == 1 (mod 5^5).at n=26A056102
• Smaller of two consecutive primes whose sum is a square.at n=14A061275
• Least number which may be expressed as the sum of a prime number and a nonzero square in exactly n different ways.at n=44A064283
• Smaller member of a twin prime pair with a square sum.at n=8A069496
• Starting positions of strings of three 8's in the decimal expansion of Pi.at n=17A083637
• Members of A083989 whose 10's complement is also a member of A083989.at n=24A083991
• Primes produced by repeated application of the formula p -> (6p +- 5) starting at the prime 2.at n=22A086321
• Smaller member of a twin prime pair with a triangular sum.at n=12A086816
• Primes of the form 8*k^2 - 1.at n=23A090684
• Primes which are also prime if their base 64 representation is interpreted as a base 10 number.at n=41A090717
• Lesser of consecutive primes whose sum is a perfect power (A001597).at n=19A091624
• Primes in A051022.at n=37A092908
• Primes p such that p + 2 and p^2 + 2^2 are primes.at n=36A107312