133903

Appears in sequences

• Smallest triangular number that contains the string n in its exact center.at n=39A062690
• The smallest triangular number that contains the digits of n in its exact middle.at n=38A163598
• Triangular numbers T from A000217 such that (4*T+1)/13 is prime.at n=28A208294
• Start of a triple of consecutive squarefree numbers each of which has exactly 4 distinct prime factors.at n=15A242607