A074901 Increasingly larger bases required for composite numbers to become prime by base reversal (A075243).

0, 2, 4, 6, 8, 9, 12, 26, 27, 34, 38, 48, 54, 60, 96, 150, 168, 180, 420, 438, 462, 468, 522, 540, 570, 828, 1320, 1782, 2130, 2142, 2280, 2370, 2448, 2700, 2760, 2790, 2808, 2922, 2952, 2982, 3012, 3402, 3570, 3582, 3972, 4218, 4860, 5148

Offset

1,2

Links

Table of n, a(n) for n=1..48.

Crossrefs

Cf. A075243.

Sequence in context: A298305 A090958 A245047 * A189294 A125990 A319776

Adjacent sequences: A074898 A074899 A074900 * A074902 A074903 A074904

Keyword

nonn,base,hard,more

Author

Robert G. Wilson v, Sep 16 2002

Extensions

More terms from Amiram Eldar, Jun 04 2021

Status

approved