26123

Appears in sequences

• n-th 4k+1 prime times (n+1)st 4k+3 prime.at n=17A048628
• Numbers n such that n + sum of prime factors of n = (n+1) + sum of prime factors of (n+1).at n=25A075654
• n^2-79*n+1601 as n runs through the lucky numbers.at n=39A087867
• Composite numbers generated by the Euler polynomial x^2 + x + 41.at n=31A145292
• Number of nondecreasing arrangements of n numbers in -(n+4)..(n+4) with sum zero and not more than two numbers equal.at n=6A188233
• Number of nondecreasing arrangements of 7 numbers in -(n+5)..(n+5) with sum zero and not more than two numbers equal.at n=5A188240
• Sum of prime divisors of n (with repetition) is one less than the sum of prime divisors (with repetition) of n+1.at n=27A228126
• Semiprimes generated by the Euler polynomial x^2 + x + 41.at n=31A228183
• Number of n X 5 0..2 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest, modulo 3.at n=32A239358
• Sequence of pairwise relatively prime numbers of class P_7 (see comment in A275246).at n=19A275252
• Numbers such that the sum of the reverse of their aliquot parts is equal to the reverse of the sum of their aliquot parts.at n=29A278948
• Nonprime squarefree numbers whose prime indices all have the same Omega (A001222) and the same sum of prime indices (A056239).at n=14A327908
• Numbers k such that A008475(k)+1 = A008475(k+1).at n=33A333801
• Numbers k such that A181894(k)+1 = A181894(k+1).at n=28A333802
• High water marks for number of primes between prime(n)^2 and prime(n+1)^2.at n=42A380135