78547

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 59 ones.at n=3A031827
• Pentagonal numbers (A000326) whose digit reversal is a prime.at n=30A115707
• Pentagonal numbers which are the arithmetic mean of two consecutive primes.at n=24A234531
• Numbers m such that gcd(s1,s2) = number of the Collatz iterations of m where s1 is the sum of the odd terms and s2 the sum of the even terms in the Collatz trajectory.at n=11A281195
• Pentagonal numbers (A000326) in which parity of digits alternates.at n=29A297644
• The first of two consecutive pentagonal numbers the sum of which is equal to the sum of two consecutive primes.at n=6A298463