87571

Appears in sequences

• Triangular numbers whose digit reversal is also a triangular number.at n=23A061455
• Non-palindromic triangular numbers whose reverse is a triangular number with the same number of digits.at n=3A066528
• Triangular numbers whose reverse is also triangular.at n=16A066569
• Triangular numbers with sum of digits = 28.at n=25A068132
• Nonpalindromic triangular numbers whose digit reversal is also a triangular number (possibly with fewer digits).at n=9A069673
• Triangular numbers whose sum of aliquot divisors is a prime number.at n=33A083676
• Triangular numbers t such that all the digits needed to write the consecutive triangular numbers from 0 to t fill exactly an equilateral triangle (no holes, no overlaps).at n=24A158030
• Triangular numbers which are sums of three consecutive primes.at n=10A167788
• The largest n-digit number whose first k digits are divisible by the k-th prime for k = 1..n.at n=4A225613
• Primitive numbers in A229307.at n=37A229311
• Numbers n such that for every k = 1, 2, ..., A305706(n)-1, it is possible to insert plus signs into the decimal representation of n^k to make sum equal n.at n=54A305707