28674

Appears in sequences

• a(0) = 1, a(n) = 28*n^2 + 2 for n>0.at n=32A010018
• Numbers n such that n through n+5 have the same number of distinct prime factors.at n=33A045934
• Indices among the primes of the primes in A020461.at n=7A138126
• Indices among the primes of the primes in A054356, The Five Hysterical Girls Theorem.at n=2A138132
• Number of (n+2) X 4 0..1 arrays with every 3 X 3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally exactly three ways, and new values 0..1 introduced in row major order.at n=19A204748
• a(n) = 3^n + 6^n + 9^n + 12^n.at n=4A220442
• Numbers k such that (2^(2k + 1) - 2)/3 + k - 1 is prime.at n=15A236547
• Numbers n such that n^3 contains the consecutive substring 2,3,5,7.at n=27A295900
• Number of ways to write n as an ordered sum of nine powers of 2.at n=28A342252
• a(n) is the start of the least run of exactly n consecutive nobly abundant numbers (A349758).at n=3A349871