161028
domain: N
Appears in sequences
- (Sum of digits of n)^5 - (sum of digits of n^5).at n=29A069979
- Triangular numbers which are 8-almost primes.at n=17A076582
- Triangular numbers in which the sum of the external digits equals the sum of the internal digits.at n=29A088289
- Triangular numbers that are sandwiched between two semiprimes; or triangular numbers t such that t-1 and t+1 are both semiprime.at n=27A121898
- Triangular numbers that are the product of three distinct triangular numbers greater than 1.at n=24A225440
- Triangular numbers divisible by the square of the sum of their digits.at n=10A243008
- Expansion of (1 + 2*x) / ((1 - 2*x)*sqrt(1 - 4*x)).at n=9A372239
- Number of incongruent n-sided "sporadic" Reinhardt polygons.at n=83A373695
- Triangular numbers that are sandwiched between two squarefree semiprimes.at n=25A375384