login
A105983
Near-repdigit semiprimes with 2 as repeated digit.
1
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
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
KEYWORD
base,nonn
AUTHOR
Shyam Sunder Gupta, Apr 29 2005
STATUS
approved