118828

Appears in sequences

• Triangular numbers whose reverse is prime.at n=24A066751
• Triangular numbers whose digit reversal is prime; trailing zeros are permitted.at n=32A115704
• Triangular numbers composed of digits {1,2,8}.at n=6A119107
• 3^(n-1)*(2*3^(n-1)+3)+1.at n=5A169723
• The first of three consecutive hexagonal numbers the sum of which is equal to the sum of three consecutive primes.at n=13A298272
• The number of n-free abundant numbers below the least number k that is not n-free whose sum of n-free divisors is larger than 2*k.at n=7A387155