A105983 Near-repdigit semiprimes with 2 as repeated digit.

122, 202, 221, 226, 262, 422, 622, 922, 2122, 2227, 2229, 2722, 4222, 8222, 20222, 22223, 22226, 22262, 22322, 22522, 22622, 22822, 25222, 32222, 52222, 202222, 222221, 222223, 222242, 222422, 223222, 224222, 226222, 262222, 272222, 622222

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..100

Example

a(2)=202 is a term because 202 is a semiprime and all digits are equal to 2 except one.

Mathematica

Rest[Select[FromDigits/@Flatten[Permutations/@Flatten[ Table[PadRight[ {n}, k, 2], {k, 3, 6}, {n, 0, 9}], 1], 1], PrimeOmega[#]==2&]]//Sort (* Harvey P. Dale, Jun 11 2018 *)

Crossrefs

Sequence in context: A224599 A207147 A222578 * A356369 A099154 A304605

Adjacent sequences: A105980 A105981 A105982 * A105984 A105985 A105986

Keyword

base,nonn

Author

Shyam Sunder Gupta, Apr 29 2005

Status

approved