139967

Properties

Appears in sequences

• Class 1+ primes: primes of the form 2^i*3^j - 1 with i, j >= 0.at n=33A005105
• Smaller term of a pair of twin primes such that prime factors of their average are only 2 and 3.at n=9A059960
• Smallest number m so that n^2 + A000330(m) is also a square, i.e., n^2 + (1 + 4 + 9 + 16 + ... + m^2) = w^2 for some w.at n=54A065610
• Duplicate of A059960.at n=9A075582
• Lesser member p of a twin prime pair such that p+1 is 3-smooth.at n=10A078883
• Number of terms in s(n), where s(n) is defined in A114483.at n=19A112361
• Twin prime pairs that sum to a power.at n=34A119768
• a(n) = p is the first twin prime (p, p+2) for which p+1 has n prime factors (n>=2, multiplicity counted).at n=11A164291
• Primes of the form 2^i*3^j - 1 with i + j = 13.at n=3A172315
• Numbers of the form i*6^j-1 (i=1..5, j >= 0).at n=32A181288
• Primes of the form 3*6^k - 1.at n=5A186104
• Primes of the form k*6^m - 1, where k is a Mersenne prime (A000668) and m >= 0.at n=10A186687
• Numbers which contain only the digit 5 in their base-6 representation, with at most one exception. If the exception is the most-significant digit, it must be the digit 1, 2, 3, or 4, otherwise the exception must be the digit 4.at n=46A188532
• Smallest lower twin prime number which sums with its upper twin prime to a perfect n-th power.at n=6A195421
• a(n) = 3*6^n-1.at n=6A198796
• Primes of the form 3n^3-1.at n=8A200846
• Primes which are the concatenation of two primes in exactly three ways.at n=20A238499
• Primes of the form 2^i * 3^j - 1 for positive i, j.at n=26A268640
• Smaller member of a twin prime pair with a perfect power sum.at n=17A270231
• Primes p such that all the composite numbers between p and its next prime have no more than 2 distinct prime factors.at n=28A303436