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A115706
Primes whose digit reversal is a pentagonal number (A000326).
1
5, 29, 53, 541, 673, 2239, 5273, 6257, 7753, 10567, 10861, 10883, 15137, 27793, 28447, 28723, 29201, 52639, 54001, 56041, 59863, 62143, 67189, 67349, 74587, 76771, 103591, 103811, 104971, 108643, 157637, 212161, 217223, 229343, 241391
OFFSET
1,1
EXAMPLE
541 is prime and 145 is the 10th pentagonal number.
CROSSREFS
Sequence in context: A147153 A300777 A177831 * A031394 A103094 A341083
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, Jan 31 2006
STATUS
approved