28921

Properties

Appears in sequences

• Primes that are palindromic in base 5.at n=36A029973
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 96 ones.at n=31A031864
• Number of partitions of n into parts not of the form 25k, 25k+9 or 25k-9. Also number of partitions with at most 8 parts of size 1 and differences between parts at distance 11 are greater than 1.at n=40A036008
• Primes which remain prime after one and after two applications of the rotate-and-add operation of A086002.at n=24A086003
• Numbers k such that k, k+1, k+2 and k+3 are 1,2,3,4-almost primes.at n=25A113000
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (0, 0, 1), (0, 1, 1), (1, 1, -1), (1, 1, 1)}.at n=7A151222
• A sequence with Somos-4 Hankel transform.at n=14A171416
• Primes such that applying "reverse and add" twice produces two more primes.at n=18A174402
• Primes of the form 8*n^2 + 2*n + 1.at n=27A188382
• Number of zero-sum -n..n arrays of 4 elements with first and second differences also in -n..n.at n=29A201875
• Primes p such that four consecutive primes starting with p are congruent to {1,2,3,4} (mod 5).at n=36A215607
• Primes p such that p = 361 + 420*k for some k.at n=28A217656
• Primes of form p*q + 30, where p and q are consecutive primes.at n=15A229570
• Base-10 representation of 1 and the primes at A262641.at n=3A262642
• a(n) = n^3 + 2*n^2 + 4*n + 1.at n=30A270867
• Numbers k such that (2*10^k + 457)/9 is prime.at n=22A281276
• Numbers n such that there is precisely 1 group of order n, 2 of order n + 1 and 3 of order n + 2.at n=19A296024
• Prime numbers in A317298.at n=28A306362
• Number of pairs (c, y) where c is an integer composition and y is an integer partition and y can be obtained from c by choosing a partition of each part, flattening, and sorting.at n=11A318567
• Number of weakly unimodal compositions of n in which the greatest part occurs exactly four times.at n=42A320315