28879

Properties

Appears in sequences

• Smallest number that takes n steps to reach 0 under "k->min product of 2 numbers whose concatenation is k".at n=12A035933
• Primes related to the nondecreasing subsequence of A053666.at n=46A069802
• a(1)=1, a(n) is the smallest integer > a(n-1) such that the sum of elements of the simple continued fraction for S(n)=1/a(1)+1/a(2)+...+1/a(n) equals n^4.at n=4A071972
• a(1)=2; a(n) for n>1 is the smallest prime number > a(n-1) such that the concatenation of all previous terms is also prime.at n=37A080155
• Primes with digit sum = 34.at n=7A106769
• a(n) = min{k>0: the n-th convergent to e equals m/k! for some m}.at n=21A120355
• Primes in toothpick sequence A153003.at n=39A153005
• a(n) = 20*n^2 - 1.at n=37A158491
• a(n) = 80*n^2 - 1.at n=18A158774
• Primes of the form 5n^2 - 1.at n=21A201783
• Primes p such that p + 4, p + 16, p + 64, p + 256 and p + 1024 are all semiprimes.at n=23A241493
• Primes of the form 6*p + 1 with p prime that are also of the form x^2 + 27*y^2 and congruent to 7 mod 24.at n=33A256172
• Primes of the form (k^3 - k^2 - k - 1)/2 for some integer k > 0.at n=9A268063
• Smallest of 4 consecutive prime numbers that when represented as a simple continued fraction, generates prime numbers in the numerator and denominator, when reduced.at n=23A270884
• Primes p such that there are exactly p solutions to y^2 + x*y + y == x^3 + x^2 - 10*x - 10 (mod p).at n=31A275777
• Numbers k whose trajectory under the Reverse and Add! operation carried out in base 16 does not reach a palindrome and (presumably) does not join the trajectory of any term m < k.at n=16A344119
• a(n) = greatest prime less than prime(n)*prime(n+1).at n=38A391805
• Prime numbersat n=3145