99981

Appears in sequences

• Sieve performed by successive iterations of steps where step m is: keep m terms, remove the next 3 and repeat; as m = 1,2,3,.. the remaining terms form this sequence.at n=29A112561
• a(n) is the last term of the analogous sequence to A121805, but with initial term n, or -1 if that sequence is infinite.at n=20A330129
• Numbers without comma-successors: these are the numbers k such that if the commas sequence A121805 is started at k instead of 1, there is no second term.at n=31A367341