20029

Properties

Appears in sequences

• Primes of the form m^2 + 3m + 9, where m can be positive or negative.at n=42A005471
• Numbers k such that the continued fraction for sqrt(k) has period 87.at n=11A020426
• a(n) is the least prime > a(n-1) whose digits do not appear in a(n-1).at n=27A030284
• Luhn primes: primes p such that p + (p reversed) is also a prime.at n=28A061783
• Primes p = p_(n+1) such that p_n + p_(n+2) = 2*p_(n+1) + 12.at n=17A095673
• Primes p = prime(i) of level (1,3), i.e., such that A118534(i) = prime(i-3).at n=34A118467
• Number of partitions of n having no parts with multiplicity 3.at n=39A118807
• Prime sums of 6 positive 5th powers.at n=37A123035
• Primes congruent to 28 mod 59.at n=36A142755
• Primes congruent to 21 mod 61.at n=38A142819
• Total number of '1' bits in the terms of 'rows' of A178746.at n=12A178748
• Primes having only {0, 2, 9} as digits.at n=11A261268
• Number of integer partitions of n containing their multiset of multiplicities (as a submultiset).at n=52A325702
• a(n) is the numerator of (1134*n^3 + 2097*n^2 + 1188*n + 193)/(10368*n^4 + 20736*n^3 + 14112*n^2 + 3744*n + 320).at n=2A374607
• Smallest k such that A073734(k) = n, where A073734 is the GCD of consecutive terms of the EKG sequence A064413.at n=21A382222
• Primes having only {0, 2, 3, 9} as digits.at n=44A386046
• Primes having only {0, 2, 4, 9} as digits.at n=22A386048
• Primes having only {0, 2, 5, 9} as digits.at n=20A386050
• Primes having only {0, 2, 6, 9} as digits.at n=22A386052
• Primes having only {0, 2, 7, 9} as digits.at n=42A386054