A117682 Prime numbers for which the product of the digits is a triangular number.

3, 11, 13, 23, 31, 37, 47, 53, 59, 61, 73, 101, 103, 107, 109, 113, 131, 137, 149, 173, 227, 229, 251, 263, 307, 311, 317, 353, 401, 409, 419, 433, 491, 503, 509, 521, 601, 607, 661, 701, 709, 769, 809, 853, 907, 941, 967, 1009, 1013, 1019, 1021, 1031, 1033

Offset

1,1

References

Elena Deza and Michel Marie Deza, Figurate numbers, World Scientific Publishing (2012), page 292.

Links

Table of n, a(n) for n=1..53.

Example

59 is in the sequence because (1) it is a prime number and (2) the product of its digits 5*9=45 is a triangular number.

Crossrefs

Cf. A000217, A053666.

Sequence in context: A116438 A191078 A281816 * A045429 A168164 A296933

Adjacent sequences: A117679 A117680 A117681 * A117683 A117684 A117685

Keyword

nonn,base

Author

Luc Stevens (lms022(AT)yahoo.com), Apr 27 2006

Status

approved