131213

Properties

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 55.at n=6A031643
• Primes arising in A036976.at n=27A036977
• Primes arising in A036978.at n=33A036979
• Primes formed from the concatenation of n, n-1 and n for some n > 0.at n=1A068659
• Primes in A002049.at n=27A185846
• Primes of the form abcdabcd..abcdab.at n=21A187114
• Primes of the form 5n^2 - 7.at n=30A201788
• a(n) is the smallest prime greater than 2^n such that 2 is a primitive root modulo a(n).at n=17A250396
• Prime numbers whose binary expansion contains only prime powers of 2 and the zeroth power.at n=19A342475
• Prime numbersat n=12260