BlockAdditions.m

typedef void (^JRIterationBlock)(NSUInteger index);

static inline void invokeBlockIterativelyUsingRange(JRIterationBlock block, NSRange rng) {
    NSParameterAssert(block); 
    for(NSUInteger i = rng.location; i < NSMaxRange(rng); ++i) {
        block(i);
    }
}

@implementation NSNumber (BlockAdditions)

- (void)times:(JRIterationBlock)block {
   invokeBlockIterativelyUsingRange(block, (NSRange) {0, [self unsignedIntegerValue]});
}

- (void)upTo:(NSUInteger)upperBound do:(JRIterationBlock)block {
   NSUInteger value = [self unsignedIntegerValue];
   invokeBlockIterativelyUsingRange(block, (NSRange) {value, MAX(value, upperBound)});
}

@end

NSNumber+BlockAdditions.m

static inline void invokeBlockIterativelyUsingRange(void(^)(NSUInteger index)block, NSRange rng) {
    NSParameterAssert(block); 
    for(NSUInteger i = rng.location; i < NSMaxRange(rng); ++i) {
        block(i);
    }
}

@implementation NSNumber (BlockAdditions)

- (void)times:(void(^)(NSUInteger index))block {
   invokeBlockIterativelyUsingRange(block, (NSRange) {0, [self unsignedIntegerValue]});
}

- (void)upTo:(NSUInteger)upperBound do:(void(^)(NSUInteger index))block {
   NSUInteger value = [self unsignedIntegerValue];
   invokeBlockIterativelyUsingRange(block, (NSRange) {value, MAX(value, upperBound)});
}

@end

NSNumber_BlockAdditions.m

typedef void (^JRIterationBlock)(NSUInteger index);

static inline void invokeBlockIterativelyUsingRange(JRIterationBlock block, NSRange rng) {
    NSParameterAssert(block); 
    for(NSUInteger i = rng.location; i < NSMaxRange(rng); ++i) {
        block(i);
    }
}

@implementation NSNumber (BlockAdditions)

- (void)times:(JRIterationBlock)block {
   invokeBlockIterativelyUsingRange(block, (NSRange) {0, [self unsignedIntegerValue]});
}

- (void)upTo:(NSUInteger)upperBound do:(JRIterationBlock)block {
   NSUInteger value = [self unsignedIntegerValue];
   invokeBlockIterativelyUsingRange(block, (NSRange) {value, MAX(value, upperBound)});
}

@end

NSNumberBlockAdditions.m

static inline void invokeBlockIterativelyUsingRange(void(^)(NSUInteger index)block, NSRange rng) {
    NSParameterAssert(block); 
    for(NSUInteger i = rng.location; i < NSMaxRange(rng); ++i) {
        block(i);
    }
}

@implementation NSNumber (BlockAdditions)

- (void)times:(void(^)(NSUInteger index))block {
   invokeBlockIterativelyUsingRange(block, (NSRange) {0, [self unsignedIntegerValue]});
}

- (void)upTo:(NSUInteger)upperBound do:(void(^)(NSUInteger index))block {
   NSUInteger value = [self unsignedIntegerValue];
   invokeBlockIterativelyUsingRange(block, (NSRange) {value, MAX(value, upperBound)});
}

@end

usage.m

[@(5) times:^(NSUInteger index) {
   NSLog(@"%u", index);
}];

[@(5) upTo:100 do:^(NSUInteger index) {
   NSLog(@"%u", index);
}];