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A290751 Primes p such that the concatenation 1p is a semiprime. 3
5, 11, 19, 23, 29, 41, 43, 59, 61, 83, 101, 137, 139, 149, 157, 167, 191, 199, 211, 227, 241, 257, 263, 271, 293, 313, 317, 337, 347, 349, 379, 383, 389, 397, 401, 457, 461, 509, 541, 563, 569, 577, 631, 641, 643, 661, 673, 691, 727, 739, 751, 757, 761, 769 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
CROSSREFS
Sequence in context: A349553 A056996 A102184 * A320518 A084720 A032674
KEYWORD
nonn,base
AUTHOR
N. J. A. Sloane, Aug 17 2017, following a suggestion from J. M. Bergot.
EXTENSIONS
More terms from Alois P. Heinz, Aug 27 2017
STATUS
approved

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Last modified April 23 15:20 EDT 2024. Contains 371916 sequences. (Running on oeis4.)