70876

Appears in sequences

• Triangular numbers whose reverse is prime.at n=15A066751
• Triangular numbers with sum of digits = 28.at n=19A068132
• Triangular numbers k*(k+1)/2 such that A068865(k) = k*(k+1)/2.at n=27A068866
• Triangular number x such that x + reverse of x is a prime.at n=19A072387
• Triangular numbers which are one more than a product of distinct triangular numbers.at n=29A083517
• Triangular numbers whose digit reversal is prime; trailing zeros are permitted.at n=21A115704
• a(n) = binomial(F(n), 2) where F(n) = A000045(n).at n=14A191797
• Triangular numbers representable as b! + c^2.at n=37A230364
• Expansion of x^2*(10-5*x+x^2)/((1-x)^4*(1-x^2)).at n=26A331429