284738

Appears in sequences

• Integers of the form : (n plus OR minus 1 = prime) and (n plus OR minus 3 = prime) and (n plus OR minus 5 = prime) ...and (n plus OR minus 11 = prime).at n=17A145213
• a(n) is the least semiprime such that a(n) - n and a(n) + n are the previous and the next semiprimes.at n=16A365222