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A115705
Primes whose digit reversal is a triangular number.
2
3, 19, 307, 523, 631, 1171, 1801, 5563, 8731, 12781, 16831, 30097, 53299, 54181, 56629, 62011, 63667, 64063, 66457, 67411, 67807, 108127, 118801, 128413, 130303, 131059, 160453, 188677, 192637, 196597, 300583, 302851, 357661
OFFSET
1,1
LINKS
EXAMPLE
307 is prime and 703=T(73).
MATHEMATICA
Select[Prime[Range[20000]], OddQ[Sqrt[1+8IntegerReverse[#]]]&] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jun 01 2019 *)
CROSSREFS
Cf. A115704.
Sequence in context: A356512 A143597 A224681 * A136171 A102586 A326902
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, Jan 31 2006
STATUS
approved