21742

Appears in sequences

• (n,3,4) difference families over Z_n.at n=10A011994
• Numbers k such that 161*2^k-1 is prime.at n=21A050832
• Positions of records in A268672.at n=21A268713
• Numbers k such that (52*10^k - 1)/3 is prime.at n=20A282508
• The fixed points of A355702.at n=47A356017
• The internal state of the Sinclair ZX81 and Spectrum random number generator.at n=11A357907