A031344 Write primes in base 10 but interpret as if in base 12.

2, 3, 5, 7, 13, 15, 19, 21, 27, 33, 37, 43, 49, 51, 55, 63, 69, 73, 79, 85, 87, 93, 99, 105, 115, 145, 147, 151, 153, 159, 175, 181, 187, 189, 201, 205, 211, 219, 223, 231, 237, 241, 253, 255, 259, 261, 301, 315, 319, 321, 327, 333, 337, 349, 355

Offset

1,1

Links

Table of n, a(n) for n=1..55.

Formula

a(n) = A102487(A000040(n)). - R. J. Mathar, Apr 09 2011

Maple

A102487 := proc(n) local dgs; dgs := convert(n, base, 10) ; add(op(d, dgs)*12^(d-1), d=1..nops(dgs)) ; end proc:
A031344 := proc(n) A102487(ithprime(n)) ; end proc: # R. J. Mathar, Apr 09 2011

Crossrefs

Sequence in context: A228891 A168484 A217907 * A004682 A173105 A024783

Adjacent sequences: A031341 A031342 A031343 * A031345 A031346 A031347

Keyword

nonn,base

Author

Jeff Burch

Status

approved