39343

Properties

Appears in sequences

• Let (p1,p2), (p3,p4) be pairs of twin primes with p1*p2=p3+p4-1; sequence gives values of p2.at n=28A047977
• Prime Friedman numbers.at n=27A112419
• Least primes p1 such that gap between p1 and p2=nextprime(p1) contains no semiprimes. Gap is 1 for n=0 (first term) and 2n for n=1..30.at n=8A136344
• Number of planar triangular n X n X n nonnegative integer grids with every similarly oriented 3 X 3 X 3 subtriangle summing to 6.at n=5A154056
• Integers n such that by inserting between their digits + or - or * or / or ^ or nothing (i.e., concatenate two digits) you recover n back in a nontrivial way.at n=25A157198
• Primes which are triangular numbers plus 3.at n=26A159047
• n^3 + n-th cubefree number.at n=33A180499
• Primes having only {3, 4, 9} as digits.at n=32A199349
• Primes among "orderly" Friedman numbers A080035.at n=6A252483
• Lower ends of record gaps between numbers that are either primes or semiprimes.at n=8A275013
• Least number that is the start of a prime-semiprime gap of size n.at n=15A278351
• a(n) = a(n-3) + a(n-2) + gcd(a(n-2), a(n-1)) with a(1) = a(2) = a(3) = 1.at n=35A370202
• Prime numbersat n=4142