28979

Properties

Appears in sequences

• Triangular spiral sequence: sequence is written as a triangular spiral, each entry is the sum of the row in the previous direction containing the previous entry.at n=29A063177
• Primes p = p_(n+1) such that p_n + p_(n+2) = 2*p_(n+1) + 12.at n=32A095673
• Integer part of the area of consecutive prime sided tetragons with one right angle.at n=39A105270
• Primes with digit sum = 35.at n=5A106770
• Positions where A109890(n) = Sum_{i = 1..n-1} A109890(i).at n=39A111315
• Primes p such that q-p = 30, where q is the next prime after p.at n=36A124596
• a(1)=a(2)=1. a(n+1) = a(n) + a(smallest prime dividing n).at n=44A128216
• Father primes of order 11.at n=28A136080
• Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-1100-0111 pattern in any orientation.at n=14A146696
• Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1110-0110-0111 pattern in any orientation.at n=11A147504
• Primes p such that 3*p+2, 5*p+4 and 7*p+6 are also prime.at n=30A173876
• Primes p such that reversal(p) - 13 is a square.at n=29A176371
• Primes related to the strictly increasing subsequence of A053666.at n=39A230041
• Primes with integer arithmetic mean of digits = 7 in base 10.at n=35A285227
• Number of necklace compositions of n with no part circularly followed by a divisor.at n=35A328600
• Numerator of the average distance among first n primes.at n=46A332094
• Primes whose position in the Wythoff array is immediately followed by a prime both in the next column and the next row.at n=18A352537
• a(n) = A119435(2^n).at n=33A353035
• Number of integer partitions of n whose parts do not have weakly decreasing numbers of prime factors (A001222).at n=42A358910
• Number of perfect powers k which are not prime powers, and 1 < k < 10^n.at n=8A365670