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A043049
a(n)=(s(n)+1)/4, where s(n)=n-th base 4 palindrome that starts with 3.
1
1, 4, 13, 14, 15, 16, 49, 54, 59, 64, 193, 197, 201, 205, 210, 214, 218, 222, 227, 231, 235, 239, 244, 248, 252, 256, 769, 789, 809, 829, 834, 854, 874, 894, 899, 919, 939, 959, 964, 984, 1004, 1024, 3073, 3089, 3105, 3121, 3141
OFFSET
1,2
CROSSREFS
Sequence in context: A081738 A232496 A239256 * A135465 A135783 A135406
KEYWORD
nonn,base
STATUS
approved